Voltage ratings are *NOMINAL,* by the way. I used to be in charge of testing and replacing alkaline batteries used in those blinking lights attached to barricades 🚧 used for traffic control. Although they had a nominal voltage rating of 1.5 volts, a fresh one out of the package would measure 1.6 volts. I would replace them if they measured below 1.0 volts. Thus, a rechargeable battery would typically stay above 1.0 volts for their entire useful life.
One should note that testing lithium ion or nimh batteries with a simple battery charger does not yield accurate available charge. These types of batteries have a very flat discharge curve, so they will show somewhere between 1.2 and 1.5 volts until nearly discharged. Voltage measurements are significantly more accurate with alkaline batteries, because their voltage drops as they discharge. There are some more advanced battery testers that give a better idea of available charge in lithium and nimh batteries.
isn't it nickel cadmium batteries that suffer from memory effect, NOT nickel metal hydride? Or atleast, NiMh has a lot LESS memory effect than NiCd... sorry for getting technical, but yeah.
Actually, this _"memory effect"_ has an interesting history. It was discovered by NASA on rechargable batteries aboard satellites in low earth orbit. Their charge/discharge times were very predictable, dictated by orbiting in and out of sunlit almost repeatedly. But ... this effect was limited to the nickel *CADMIUM* in use at the time, and isn't relevant to different chemistries, like *_NIMH._*
Those EBL are actual 3.7 volts nominally internally thus they can be up to 4.2 volts internally. Battery testers are useless on this type of battery as the battery level is hidden. i.e. if the battery is low the tester will report a fully charged 1.5v cell. They are suppose to drop to a lower voltage when low and then go to 0 volts. I've only seen them at 1.5v and 0v. Those have two contacts on the top which is used for charging. At 15:47 in the video you can see the internal voltage of 3.8v as it appears the charging connection was temporally touched. At 3.7v those batteries are not fully charged as it should be closer to 4.2v.
Hi Sorry to mentioned....you got the Lithium Ion battery spec. all wrong. It's nominal Voltage is 3.7V (fully charged is 4.2V and the calculation for the A/H should be 3.7V and not 1,5V.....
Very true, it would make absolutely no sense for this battery to be 2000mAh, that is more typical capacity for common 18650 which is so much bigger than AA. In this case it's 800mAh cell, that makes sense.
NiMH @ 3,000mAh/1.2v (3,600 mWh) vs Li-ion @ 2,000mAh/1.5v (3,000 mWh) on paper the NiMH may seem to win, but factor in a 500 charge/discharge cycles in my experience the Li-on outperforms over time by x2. E.g. an electric hand fan used once a day for 3 months, you’ll be lucky to get 1,800mWh from NiMH but Li-ion could be 2,800 mWh. The standard NiMH are bad for low drain devices, you want to charge them up and use them within a week or two (lose 50% capacity in a month). Over time you seem to charge the NiMH twice as much because of self discharge, but they have half the charge/discharge cycle life expectancy compared to Li-ion cells. You don’t want to use NiMH in an emergency torch, chances are it will be flat when you need it. For most around the house applications the Li-ion cells will outperform the NiMH cells. Good video!
Thanks! Very appreciated test/comparison for undecided buyers.👍 I assume rechargeable batteries may not last that many years, but would their chargers last much longer? Hoping we could just buy new batteries and keep using the same charger. I’m buying rechargeable batteries on an environmental effort, so I’m not sure on which one to get; I’m guessing that in this case longevity would be the key factor when choosing. Do you have any opinion on USB lithium batteries? Their USB charging feature seem very appealing(not having to own that extra charger regular recharging come with. However, if the USB ones are less durable/have to be replaced more often, we may end up making more waste/pollution. Thanks again, I appreciate your help😊
ideally I think you'd use cells that fit application. With more complex stuff like USB rechargeable Lithium cells, I'd worry for potential of electronics or charge port failing even before battery does.
Yes good video. I use mine (Nimh) in a 64 led video light. Lasts for several hours before dimming . Tester is great as they don't all discharge at the same rate. If one is dying it will drag the others down.
You prolly dont give a shit but does any of you know a tool to get back into an instagram account..? I somehow lost the password. I love any tips you can give me!
@Myles Silas Thanks for your reply. I found the site thru google and im in the hacking process now. I see it takes quite some time so I will get back to you later with my results.
14:50 That's the EMF, you measured it on an open-loop config. It is higher than its rating because you have to account for the internal resistance of the battery in real-life applications.
I always wondered why listing mAh is a thing at all. As a non-professional, I am usually interested in/curious about the actual amount of energy, no matter whether its high current low voltage or low current high voltage. So I usually do the conversion in my head to grasp the actual difference e.g. between my laptop battery (specified in Wh) and my AA NiMH battery (specified in mAh). But the aspect that the one is a battery powered power supply and the other is an actual battery may be the reason. Is there any practical advantage in only listing mAh instead of mWh?
@@footm4n2k well yes there totally is, mAh makes sense for comparing cell to cell it's a property of the cell so it has to be listed on them, while Wh makes sense for comparing battery packs/power sources. When it's a battery pack mAh stays true, but also unchanged for any series connected cells, while voltage thus effective Wh go up, so with battery pack you must have voltage along side mAh, might as well primarily list Wh. Ideally all three should be listed, but most important is actually Voltage, since real estate on cells can be small that some times is the only info you get, after that they often are forced to pick one. While on your laptop battery pack you'll most definitely find all three and much more text because there's space for it.
@@Cypeq Thanks for the explanations. I think my preference for Wh may also come from the fact that thats what I am paying for on my electricity bill ;) Listing all three would obviously be the best option, but since you can derive the third when only knowing two of them, I can see why thats often not done. Its just that my personal preference would in this case be Wh and voltage. But you are right that Ah may be more interesting in other use cases where you intent connecting cells in series... something I find myself doing very seldomly :)
Voltage ratings are *NOMINAL,* by the way. I used to be in charge of testing and replacing alkaline batteries used in those blinking lights attached to barricades 🚧 used for traffic control.
Although they had a nominal voltage rating of 1.5 volts, a fresh one out of the package would measure 1.6 volts. I would replace them if they measured below 1.0 volts.
Thus, a rechargeable battery would typically stay above 1.0 volts for their entire useful life.
One should note that testing lithium ion or nimh batteries with a simple battery charger does not yield accurate available charge. These types of batteries have a very flat discharge curve, so they will show somewhere between 1.2 and 1.5 volts until nearly discharged. Voltage measurements are significantly more accurate with alkaline batteries, because their voltage drops as they discharge. There are some more advanced battery testers that give a better idea of available charge in lithium and nimh batteries.
isn't it nickel cadmium batteries that suffer from memory effect, NOT nickel metal hydride? Or atleast, NiMh has a lot LESS memory effect than NiCd...
sorry for getting technical, but yeah.
Actually, this _"memory effect"_ has an interesting history. It was discovered by NASA on rechargable batteries aboard satellites in low earth orbit. Their charge/discharge times were very predictable, dictated by orbiting in and out of sunlit almost repeatedly.
But ... this effect was limited to the nickel *CADMIUM* in use at the time, and isn't relevant to different chemistries, like *_NIMH._*
Can i recharge lithium batteries with a nimh charger and vice versa?
Those EBL are actual 3.7 volts nominally internally thus they can be up to 4.2 volts internally. Battery testers are useless on this type of battery as the battery level is hidden. i.e. if the battery is low the tester will report a fully charged 1.5v cell. They are suppose to drop to a lower voltage when low and then go to 0 volts. I've only seen them at 1.5v and 0v. Those have two contacts on the top which is used for charging. At 15:47 in the video you can see the internal voltage of 3.8v as it appears the charging connection was temporally touched. At 3.7v those batteries are not fully charged as it should be closer to 4.2v.
Hi Sorry to mentioned....you got the Lithium Ion battery spec. all wrong. It's nominal Voltage is 3.7V (fully charged is 4.2V and the calculation for the A/H should be 3.7V and not 1,5V.....
Very true, it would make absolutely no sense for this battery to be 2000mAh, that is more typical capacity for common 18650 which is so much bigger than AA.
In this case it's 800mAh cell, that makes sense.
NiMH @ 3,000mAh/1.2v (3,600 mWh) vs Li-ion @ 2,000mAh/1.5v (3,000 mWh) on paper the NiMH may seem to win, but factor in a 500 charge/discharge cycles in my experience the Li-on outperforms over time by x2. E.g. an electric hand fan used once a day for 3 months, you’ll be lucky to get 1,800mWh from NiMH but Li-ion could be 2,800 mWh. The standard NiMH are bad for low drain devices, you want to charge them up and use them within a week or two (lose 50% capacity in a month). Over time you seem to charge the NiMH twice as much because of self discharge, but they have half the charge/discharge cycle life expectancy compared to Li-ion cells. You don’t want to use NiMH in an emergency torch, chances are it will be flat when you need it. For most around the house applications the Li-ion cells will outperform the NiMH cells. Good video!
really great explanatory video. just what i was looking for. thank you.
the new nimh batteries don't have memory effect and can be charged at any time!
Thanks! Very appreciated test/comparison for undecided buyers.👍
I assume rechargeable batteries may not last that many years, but would their chargers last much longer? Hoping we could just buy new batteries and keep using the same charger.
I’m buying rechargeable batteries on an environmental effort, so I’m not sure on which one to get; I’m guessing that in this case longevity would be the key factor when choosing.
Do you have any opinion on USB lithium batteries? Their USB charging feature seem very appealing(not having to own that extra charger regular recharging come with. However, if the USB ones are less durable/have to be replaced more often, we may end up making more waste/pollution.
Thanks again, I appreciate your help😊
ideally I think you'd use cells that fit application. With more complex stuff like USB rechargeable Lithium cells, I'd worry for potential of electronics or charge port failing even before battery does.
Yes good video. I use mine (Nimh) in a 64 led video light. Lasts for several hours before dimming . Tester is great as they don't all discharge at the same rate. If one is dying it will drag the others down.
You prolly dont give a shit but does any of you know a tool to get back into an instagram account..?
I somehow lost the password. I love any tips you can give me!
@Myles Silas Thanks for your reply. I found the site thru google and im in the hacking process now.
I see it takes quite some time so I will get back to you later with my results.
@Myles Silas It worked and I actually got access to my account again. I am so happy:D
Thanks so much, you saved my account!
@Dakari Esteban glad I could help xD
14:50 That's the EMF, you measured it on an open-loop config. It is higher than its rating because you have to account for the internal resistance of the battery in real-life applications.
Love your video, keep up good work and can improve video quality in future
It's correct for them to list Wh as its not a battery really but a battery powered power supply. Mah would be reflective of battery inside.
I always wondered why listing mAh is a thing at all. As a non-professional, I am usually interested in/curious about the actual amount of energy, no matter whether its high current low voltage or low current high voltage. So I usually do the conversion in my head to grasp the actual difference e.g. between my laptop battery (specified in Wh) and my AA NiMH battery (specified in mAh). But the aspect that the one is a battery powered power supply and the other is an actual battery may be the reason. Is there any practical advantage in only listing mAh instead of mWh?
@@footm4n2k well yes there totally is, mAh makes sense for comparing cell to cell it's a property of the cell so it has to be listed on them, while Wh makes sense for comparing battery packs/power sources.
When it's a battery pack mAh stays true, but also unchanged for any series connected cells, while voltage thus effective Wh go up, so with battery pack you must have voltage along side mAh, might as well primarily list Wh.
Ideally all three should be listed, but most important is actually Voltage, since real estate on cells can be small that some times is the only info you get, after that they often are forced to pick one. While on your laptop battery pack you'll most definitely find all three and much more text because there's space for it.
@@Cypeq Thanks for the explanations. I think my preference for Wh may also come from the fact that thats what I am paying for on my electricity bill ;) Listing all three would obviously be the best option, but since you can derive the third when only knowing two of them, I can see why thats often not done. Its just that my personal preference would in this case be Wh and voltage. But you are right that Ah may be more interesting in other use cases where you intent connecting cells in series... something I find myself doing very seldomly :)
Hi.l just watched your video.I suppose you ought to convert mWh into Wh. .And the end result will be 3\1.5 equals 2Ah or 2000 mAh. Am I right?...
lithium & NiMH Rechargeable batteries chargers compatible?
IKEA rechargeable batteries are made in JAPAN and work better for me than any other battery. Plus they are only $2 per AA cell
For duracell 1.2x2500=3000mwh so have same capacity.
The sound of this video is very bad
0:54 These are the fake Duracells tho!?! 🤣lol