+Altema22 9 that's cray... u must be a harcored phone user 24/7 ... I'm guessing ur under 18 and in school which explains ur hardcore usage.... we call people like u... Power Users which consists of Teens with all the time 2 spare after 3pm, Work office Professionals who use their phones for work from emails to texts to even gaming, the social network internet celebs who are always On and checking their stats 24/7 which is why they have $$$ to blow theyre also entrepreneurs and then there's the regular power users who are adults 21-40 who spent their time growing their knowledge and are on top of their tech world, know most popular apps and have the best Instas I've ever seen all while traveling their city (cities) and capturing The beauty of Life ...
No, I'm an engineer who has different power banks for different purposes, and I'm often loaning them out to friends and family. Power outage? No problem! I took a flight a couple years ago and sat next to a wonderful girl who was worried because the plane had no USB power for her phone, so I gave her my only power bank at the time. I bought a couple different replacements, but I'll pick one up just because it is interesting, and that began my collection. Oddly, my phone is one that lasts a day or two on each charge, so I don't really NEED power banks, but I do have fun with them. I do use one to charge my phone, because that model (Aukey 15,000 mAh) automatically disconnects 45 minutes after your phone is full.
PS: My favorites are the Aukey PB-T3 mentioned above because it has Quickcharge. the PowerAdd Pilot 2GS because it is slim and fits in my pocket, and the Kmashi K-MP806 because it has an awesome desk lamp that is perfect for camping or hotel stays.
+Gary Sims so it turns out that devices heating during charging because of current conversion, interesting. I think we all should blame USB technology for that.
My Samsung 11300 power bank fully charges my note 5 twice and the 3rd charge only to 90% , I searched alot but never found that ideal solution .. thumbs-up
multiply your phone's capacity by 1.5 is the same as multiplying by 3 then dividing by 2. or to make it sound simple. just add half of your phone's capacity on top.
I like how Xiaomi does that business. Have 5K power bank and it has note on it that it will deliver 3300 on 5.1V which is almost exactly = 5000 / 1.5. Being honest and deliver high quality products is a good way to go :)
You probably dont care but if you're bored like me during the covid times you can stream pretty much all the latest movies on instaflixxer. Been binge watching with my girlfriend these days xD
All of the Gary explains videos are so, so helpful! I’ve started to relise that whenever I have a question about my Samsung phone I can just come here and there’ll be an answer!
love Gary's english ,it is not hard to understand for non native english speakers,thank you Gary for useful information but please begin video with hello,hi or something like that :)
I had noticed this sort of thing happening but didn't know why. This video is great. It is really nice to understand what is going on. Thanks again please keep up these videos.
This video has clarified me because I was always confused with different power banks/external batteries. I myself have around six of power banks which doesn't give my Samsung S6 Edge a full charge. I got so much annoyed that I carry S6 Edge charger with me everywhere I go. Thanks Gary, You have explained in the best possible way.
Thanks Garry ! I little know that conversion and heat etc. causes that loss of capacity but you explained with technical details very nicely. Great work !
I am always pleased when I hear about improvements in battery technology. However, there is nothing better than having a replaceable battery or many of them with charging cases.
I like your videos bc they are usually not about phone only. They are very informative so keep up the good work. No need for flashy fancy video intro's, etc.
Komain I wasn't trying to say it is the correct way of calculating it.. i was just giving an easier way for people to calculate it from the rough estimate the person in the video was suggesting.
I think there was a small misunderstanding behind some of these conversions. To be more specific, the battery that is actually inside the portable banks is actually almost identical to the battery inside the phone, it operates over the same voltage range, which is about 3.7V *on average.* A fully charged battery will have voltage of 4.2V (however, not the other way around: a battery at 4.2V is not _necessarily_ fully charged.) and can go as low as 3V before damage to the battery occurs. Because the voltage of the battery inside the battery bank goes down over time as it depletes, the converter inside it needs to draw more and more current from it to keep up with the 5V 1A or so charging. Similarly, as the battery in the phone charges, it charges at a constant current (say, about 1A.) and I think in phones they use linear charger rather than the more efficient switching topology, so 5V 1A goes in, and 1A at somewhere between 3V and 4.2V, at 1A goes into the battery. The difference between the voltage of the battery in the phone and the USB is power, multiplied to the current, that is completely pissed away. Yeah sadly it is not super simple, so I commend you for doing as good a job as you did on this subject, it is not an easy one for some to grasp, especially all the hairy details. 66% efficiency sounds about right, although really I was hoping for closer to 70% or 80%. But considering that there are 2 conversions which lose about 20-30% power each, it makes sense.
There are so many people on RUclips who do tech "reviews" and have no idea what they are talking about. 80% of them that do power bank reviews need to watch this video as they all say a 10,000 mAh power bank will charge a 3000 mAh phone just over 3x which is totally wrong. They need to watch this video.
Gary is very interesting and quite good at explaining these things. I remember one of his videos regarding java with android phones and I found it very interesting.
Great informative video man, iv also find that people sometimes dont take into account when they are charging and using the phobe simultaneously drains more from the power bank hence less charge when drained.
This was a very useful video. I've always suspected that heat caused some imperfect energy transfer but now you've shown the numbers to support it. A lot of good information for us "phone geeks" or whatever we call ourselves to tell our friends and family. Thanks
It basically has to go through 2 transformers. All transformers lose power in the form of heat and a generated magnetic shield. Simple electric circuits... Makes you wonder why at least the batteries are not 5V. The mobile integrated circuits architecture might not be suited for 5V but surely they can make the batteries to match. Great job on the testing Gary!
you forget to mention that while you charge your phone, it still drains battery even if its powered off, so that means your calculations (math are wrong). the capacity dosnt fly away, its energy and it dosnt magically dissapears just because it is converted to a lower voltage. also you forgot the most basic thing out of all, in order a battery to get charged it needs higher voltage, that means a battery at 2V cant be charged with 1.5V, the energy on the power bank is still there but cant to the battery of your phone and electronics has a lower voltage limit in order to work and to do the up-conversion. so in the same time your phone battery gets more voltage 1-2-3-4 volts and your power bank goes the other way around, plus the heat and the conversions and the phone drain and also the marketing lies that this battery is X mAh and also that both batteries are not at its maximum potential after some use and the cables resistance and the story goes on..... but i really agree with your rule of thumb :)
basically some of the energy is lost as heat when charging. But it would be nice to see a comparison of how bad the energy loss is with various charger / phone combinations.
A powerbank always gives 50% of his charge. If you have a 3000mah phone and a 6000mah powerbank. The first time it wil charge 100%. the second time it wil charge 50% this is because you only have 3000mah charge left on your powerbank and the battery wil devide the power equal between it self, the powebank and the phone. the third time it wil be the have of that, 25%. when you use a 10.000mah powerbank for your 3000mah phone. the powerbank gives you a maximum of 50% of his charge, 5000mah. your phone has a maximum of 3000mah so it wil not use it all. 10.000 - 3.000 = 7.000mah will be left on your powerbank. For the second charge, you get 50% of 7.000mah. the maximum charge you get now is 3.500mah. 7.000 - 3.000 = 4000mah wil be left on your powerbank. you got 2 full charges. because now 50% of 4.000mah = 2.000 mah your phone wil only charge for 2/3 (67%).
+Android Authority I own a power bank by a company called Vinsic, the power banks name is Alien 20,000MAH smart power bank. My Samsung Galaxy Tab 4 houses a 4,000MAH. This particular power bank it intelligently knows the device it's plugged into and outputs the correct AMPS the tablet needs. I've been able to perform a full charge and several partial charges with this power bank off of one charge.
I have a RavPower 26800mah. It's really good. Takes a very long time to fully charge but holds that charge for a long time too. So you don't need to charge day after day. And because it iCharge, it charges my phone 2x faster than being plugged into the mains. It's an awesome device to have and works brilliantly.
First, there is no batteries with nominal 5V, and second, their voltage vary much, for example, 3,6V li-on battery is charged to 4,20V, and discharged to 2,5V. So if you would have 5v nominal battery it would have about 7V when fully charged and it could kill your smartphone, but when almost discharged it will have 4V which is to small and your phone will not charged at all.
Actually Gary's rule of thumb is highly accurate- I got a 4000 mAh charger to charge my 2960 mAh phone and it got to only 78% so I returned it and got a 4400 mah power pack by the same brand and it got me to 100% with a tiny bit to spare. 4400 is 1.5x 2960 and it was merely enough so well done!
A powerbank always gives 50% of his charge. If you have a 3000mah phone and a 6000mah powerbank. The first time it wil charge 100%. the second time it wil charge 50% this is because you only have 3000mah charge left on your powerbank and the battery wil devide the power equal between it self, the powebank and the phone. the third time it wil be the have of that, 25%. when you use a 10.000mah powerbank for your 3000mah phone. the powerbank gives you a maximum of 50% of his charge, 5000mah. your phone has a maximum of 3000mah so it wil not use it all. 10.000 - 3.000 = 7.000mah will be left on your powerbank. For the second charge, you get 50% of 7.000mah. the maximum charge you get now is 3.500mah. 7.000 - 3.000 = 4000mah wil be left on your powerbank. you got 2 full charges. because now 50% of 4.000mah = 2.000 mah your phone wil only charge for 2/3 (67%).
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
Gary should be one of the best teachers out there
The data in this video corresponds perfectly with my observations in the field. Bang-up job!
That is good to hear! Thanks.
Yes, same here. I have nine power banks, and they all tested with similar results.
+Altema22 9 that's cray... u must be a harcored phone user 24/7 ... I'm guessing ur under 18 and in school which explains ur hardcore usage.... we call people like u... Power Users which consists of Teens with all the time 2 spare after 3pm, Work office Professionals who use their phones for work from emails to texts to even gaming, the social network internet celebs who are always On and checking their stats 24/7 which is why they have $$$ to blow theyre also entrepreneurs and then there's the regular power users who are adults 21-40 who spent their time growing their knowledge and are on top of their tech world, know most popular apps and have the best Instas I've ever seen all while traveling their city (cities) and capturing The beauty of Life ...
No, I'm an engineer who has different power banks for different purposes, and I'm often loaning them out to friends and family. Power outage? No problem! I took a flight a couple years ago and sat next to a wonderful girl who was worried because the plane had no USB power for her phone, so I gave her my only power bank at the time. I bought a couple different replacements, but I'll pick one up just because it is interesting, and that began my collection. Oddly, my phone is one that lasts a day or two on each charge, so I don't really NEED power banks, but I do have fun with them. I do use one to charge my phone, because that model (Aukey 15,000 mAh) automatically disconnects 45 minutes after your phone is full.
PS: My favorites are the Aukey PB-T3 mentioned above because it has Quickcharge. the PowerAdd Pilot 2GS because it is slim and fits in my pocket, and the Kmashi K-MP806 because it has an awesome desk lamp that is perfect for camping or hotel stays.
why can't we have a "gary explains" video every day...😋
his videos gives people a great impetus towards learning the inside stuff...😂
That would be cool... but I think it would kill me!!!
+Gary Sims than why not 3 videos a week... i hope i am not asking too much...😀
+Gary Sims should have your own channel too (Sorry android authority :)
honestly their low profile videos are better and more informative then the generic mobile review videos. Nice!! 😄😄
+Gary Sims so it turns out that devices heating during charging because of current conversion, interesting. I think we all should blame USB technology for that.
My Samsung 11300 power bank fully charges my note 5 twice and the 3rd charge only to 90% , I searched alot but never found that ideal solution .. thumbs-up
multiply your phone's capacity by 1.5 is the same as multiplying by 3 then dividing by 2.
or to make it sound simple. just add half of your phone's capacity on top.
I like how Xiaomi does that business. Have 5K power bank and it has note on it that it will deliver 3300 on 5.1V which is almost exactly = 5000 / 1.5. Being honest and deliver high quality products is a good way to go :)
Wait what is this comment doing in Gary's video ?
Same for me. I have a Xiaomi powerbank that has a 10000mAH/3,7V, but it tells me I will get a 6500mAH/5,1V.
Freeze Fun yep it transforms from 3,7v to 5v and there you lose energy
You probably dont care but if you're bored like me during the covid times you can stream pretty much all the latest movies on instaflixxer. Been binge watching with my girlfriend these days xD
@Misael Zahir yea, I've been using Instaflixxer for since december myself =)
All of the Gary explains videos are so, so helpful! I’ve started to relise that whenever I have a question about my Samsung phone I can just come here and there’ll be an answer!
Always love your videos, you make things so simple that anyone can understand.
Never stop this series. Great video once again.
Great in depth explanation Gary! 👍🏻
love Gary's english ,it is not hard to understand for non native english speakers,thank you Gary for useful information but please begin video with hello,hi or something like that :)
jusk asking is all the phone turned off while they are charging?
For these tests the phone was off.
the powerbank itself had IC, had board itself, so it need power to operate as gary explain
Antonie Huang even with the phone off, the screen goes on and slows a battery icon charging
A battery can only give half of its charge to a nother battery....
Are*
Phones*
I like that Gary's the resident smart guy for android authority. His videos may be boring to some but I'm very happy to learn from his videos.
Gary makes one of the best vids. Great job!
I had noticed this sort of thing happening but didn't know why. This video is great. It is really nice to understand what is going on. Thanks again please keep up these videos.
This video has clarified me because I was always confused with different power banks/external batteries. I myself have around six of power banks which doesn't give my Samsung S6 Edge a full charge. I got so much annoyed that I carry S6 Edge charger with me everywhere I go. Thanks Gary, You have explained in the best possible way.
Excellent work as always Gary!
Thanks Garry ! I little know that conversion and heat etc. causes that loss of capacity but you explained with technical details very nicely. Great work !
love these informational videos. keep it up!
I am always pleased when I hear about improvements in battery technology. However, there is nothing better than having a replaceable battery or many of them with charging cases.
I learned these concepts in AP Physics and now it makes so much sense.
Really like your "Gary Explains" videos. So easy to understand. Keep up the good work! 😃👊
Don't forget about electrical resistance. And did you use the same, exact cable for all the charge ups? Cable type and length can vary the resistance.
I like your videos bc they are usually not about phone only. They are very informative so keep up the good work. No need for flashy fancy video intro's, etc.
I really like Gary's videos. Always informative!
Thanks Again! Gary! Where would we be without you? SuperTech!
great series gary its so helpful
Very very informative video! i really enjoy how in depth you go with your testing! keep up the good work Gary :)
or you can do 3,000mAh x 0.66 = 1,980mAh... easier way
you can't just make this calculation and that's it. Because there is no norm for battery Volts, the conversion more or less energy gets "lost"
Komain I wasn't trying to say it is the correct way of calculating it.. i was just giving an easier way for people to calculate it from the rough estimate the person in the video was suggesting.
Oh, wasn't quite clear
Komain True =)
+Some Kid my calculation was for how much a 3000mah battery will charge a 3000 mah phone.. like in the video.
I think there was a small misunderstanding behind some of these conversions. To be more specific, the battery that is actually inside the portable banks is actually almost identical to the battery inside the phone, it operates over the same voltage range, which is about 3.7V *on average.* A fully charged battery will have voltage of 4.2V (however, not the other way around: a battery at 4.2V is not _necessarily_ fully charged.) and can go as low as 3V before damage to the battery occurs.
Because the voltage of the battery inside the battery bank goes down over time as it depletes, the converter inside it needs to draw more and more current from it to keep up with the 5V 1A or so charging. Similarly, as the battery in the phone charges, it charges at a constant current (say, about 1A.) and I think in phones they use linear charger rather than the more efficient switching topology, so 5V 1A goes in, and 1A at somewhere between 3V and 4.2V, at 1A goes into the battery. The difference between the voltage of the battery in the phone and the USB is power, multiplied to the current, that is completely pissed away.
Yeah sadly it is not super simple, so I commend you for doing as good a job as you did on this subject, it is not an easy one for some to grasp, especially all the hairy details. 66% efficiency sounds about right, although really I was hoping for closer to 70% or 80%. But considering that there are 2 conversions which lose about 20-30% power each, it makes sense.
great explanation, as an ASE certified Tech for automotive electrical systems (hybrids included) I couldn't have said it better myself.
So educational and practical! Thanks Gary!
Thanks for the presentation. This is the first time I understood all this.
Which UK mobile network do you use?
There are so many people on RUclips who do tech "reviews" and have no idea what they are talking about. 80% of them that do power bank reviews need to watch this video as they all say a 10,000 mAh power bank will charge a 3000 mAh phone just over 3x which is totally wrong. They need to watch this video.
i have a 10,000 mAh power bank and I can fully charge my S7 (3000 mAh) 3 times...strange
thank you so much for the explanation
awesome explanation mate 👏👏👏👏👏
A really helpful demonstration. Many thanks
Thanks for the info Gary! 👏👏👏
Gary is very interesting and quite good at explaining these things. I remember one of his videos regarding java with android phones and I found it very interesting.
Great explanation as always. Thanks a lot.
Very good video going in detail! 👍👍
Excellent explanation, keep up the good work!
gary. that was one good god damn experiment. always wondered what was the reason behind this!
very great intuitive explanation! Thank you!
finally someone who can explain how power bank works
thanks for the information
the loss to heat is so much more than any thing else, that you can practically say that it is the "only" reason that they don't give the full charge
Thanks , Great video 👌
i was searching for this
thanks. always helpful info
Excellent video Gary
These are by far my favourite type of videos in the channel 😁
Thanks for explaining how external battery banks work and how we can get the best one for charging my device on the go.
Great informative video man, iv also find that people sometimes dont take into account when they are charging and using the phobe simultaneously drains more from the power bank hence less charge when drained.
This was a very useful video. I've always suspected that heat caused some imperfect energy transfer but now you've shown the numbers to support it. A lot of good information for us "phone geeks" or whatever we call ourselves to tell our friends and family. Thanks
Gary Sims is Android Authorities best asset. Dude is brilliant!
Thanks a lot for this info!
Great video Gary!!! Could you also do a video on how Samsung's fast charge battery packs works etc...
Thanks for this valuable information.
Were the phones on or off during your charging test?
Off.
Very helpful, thanks for the video!
It basically has to go through 2 transformers. All transformers lose power in the form of heat and a generated magnetic shield. Simple electric circuits...
Makes you wonder why at least the batteries are not 5V. The mobile integrated circuits architecture might not be suited for 5V but surely they can make the batteries to match.
Great job on the testing Gary!
Thanks so much for making this incredibly heplpful video.
Thank you sir for this very thorough video :) This is just what I was looking for, I appreciate your time and effort! Keep it up :)
Thanks for covering this topic, i was always wondering why a 10Ah battery only charges my GN3 twice
hey Gary Thank you for the Information you had share ,this is very valueble to me
Really interesting video and experiment. Tnx Gary!
Interesting video, really learned something today. Thanks Gary and the team!! :)
Very educative. Thanks for clearing the air
very educational Gary thanks. I've always thought something wasn't right with all my power pack purchases ... now we know.
you forget to mention that while you charge your phone, it still drains battery even if its powered off, so that means your calculations (math are wrong). the capacity dosnt fly away, its energy and it dosnt magically dissapears just because it is converted to a lower voltage. also you forgot the most basic thing out of all, in order a battery to get charged it needs higher voltage, that means a battery at 2V cant be charged with 1.5V, the energy on the power bank is still there but cant to the battery of your phone and electronics has a lower voltage limit in order to work and to do the up-conversion.
so in the same time your phone battery gets more voltage 1-2-3-4 volts and your power bank goes the other way around, plus the heat and the conversions and the phone drain and also the marketing lies that this battery is X mAh and also that both batteries are not at its maximum potential after some use and the cables resistance and the story goes on..... but i really agree with your rule of thumb :)
basically some of the energy is lost as heat when charging.
But it would be nice to see a comparison of how bad the energy loss is with various charger / phone combinations.
It's also the law of diminishing return and also thermodynamics
He explained it so precisely and clearly
Really good video! I always wondering why my power bank doesn't reach it's full charge. +1 like
this guy doesn't know what he is talking about....
AMD phone oh well idk
A powerbank always gives 50% of his charge.
If you have a 3000mah phone and a 6000mah powerbank.
The first time it wil charge 100%.
the second time it wil charge 50%
this is because you only have 3000mah charge left on your powerbank and the battery wil devide the power equal between it self, the powebank and the phone.
the third time it wil be the have of that, 25%.
when you use a 10.000mah powerbank for your 3000mah phone.
the powerbank gives you a maximum of 50% of his charge, 5000mah.
your phone has a maximum of 3000mah so it wil not use it all.
10.000 - 3.000 = 7.000mah will be left on your powerbank.
For the second charge, you get 50% of 7.000mah.
the maximum charge you get now is 3.500mah.
7.000 - 3.000 = 4000mah wil be left on your powerbank.
you got 2 full charges.
because now 50% of 4.000mah = 2.000 mah your phone wil only charge for 2/3 (67%).
AMD phone k thx
YEAH!!!! thanks again . AMD
+Android Authority I own a power bank by a company called Vinsic, the power banks name is Alien 20,000MAH smart power bank. My Samsung Galaxy Tab 4 houses a 4,000MAH. This particular power bank it intelligently knows the device it's plugged into and outputs the correct AMPS the tablet needs. I've been able to perform a full charge and several partial charges with this power bank off of one charge.
Gary videos are always good
very good review and very informative
I have a RavPower 26800mah.
It's really good. Takes a very long time to fully charge but holds that charge for a long time too. So you don't need to charge day after day. And because it iCharge, it charges my phone 2x faster than being plugged into the mains.
It's an awesome device to have and works brilliantly.
Wow thanks for the video. I never knew this.
Why can't it use a 5V battery in the battery pack? Saving 1 trip of upconvertimg
First, there is no batteries with nominal 5V, and second, their voltage vary much, for example, 3,6V li-on battery is charged to 4,20V, and discharged to 2,5V.
So if you would have 5v nominal battery it would have about 7V when fully charged and it could kill your smartphone, but when almost discharged it will have 4V which is to small and your phone will not charged at all.
My reaction to this whole video is:
What?
+Drmusic13 I took biology, kinda have returned my physics knowledge back to my teacher so this video is interesting for me too
watt?
this guy is full of crap.
thank you so much for sharing this
Gary should be my computer science teacher lol
thanks u cleared the doubts ...
what about type c? Does the up conversion and down conversion takes place..?
does your battery age faster or does damage if you use it while charging or don.t do full charges?
don't forget if a power bank gives out all the charge it will hurt the battery life just like a phone
A very informative vid! Great work! =)
What about the battery packs that have a Qi pad built into them? Would they waste less energy?
Thanks gary, i always thought it was thermal waste + the energy the phone use while charging.
Actually Gary's rule of thumb is highly accurate- I got a 4000 mAh charger to charge my 2960 mAh phone and it got to only 78% so I returned it and got a 4400 mah power pack by the same brand and it got me to 100% with a tiny bit to spare. 4400 is 1.5x 2960 and it was merely enough so well done!
well, roughly, a power bank will deliver just over 2/3 of the advertised capacity, usually between 67-74% of that figure
Gary the champ! We see Interesting videos from Gary and Juan Carlos. Not so much from the others though.
That was a very informative video. Thank you.
A powerbank always gives 50% of his charge.
If you have a 3000mah phone and a 6000mah powerbank.
The first time it wil charge 100%.
the second time it wil charge 50%
this is because you only have 3000mah charge left on your powerbank and the battery wil devide the power equal between it self, the powebank and the phone.
the third time it wil be the have of that, 25%.
when you use a 10.000mah powerbank for your 3000mah phone.
the powerbank gives you a maximum of 50% of his charge, 5000mah.
your phone has a maximum of 3000mah so it wil not use it all.
10.000 - 3.000 = 7.000mah will be left on your powerbank.
For the second charge, you get 50% of 7.000mah.
the maximum charge you get now is 3.500mah.
7.000 - 3.000 = 4000mah wil be left on your powerbank.
you got 2 full charges.
because now 50% of 4.000mah = 2.000 mah your phone wil only charge for 2/3 (67%).
Great video Gary!
Now what about these battery banks that offer AC outlets? How does that conversion and power loss work out?
So freaking helpful! THANKS!!
I love you Gary you read my mind for my daily question
Gary is always explaining things in so much detail. And further more uses small words for us dummies 😂 thanks ✌
wow. that was very informative. thanks
thank you Gary 👍 learnt summit new - so I'm happy ☺