Salvaste mi vida, compré ese pack y no tenia ni la menor idea de como armarlo, en realidad pensé que estaba comprando una batería completa. Muchas gracias
Gracias por el comentario Rene, aunque tuve que usar el traductor de google !! Me alegro de que haya sacado información útil del video y tal vez haya podido armar un paquete usando algunas celdas de litio 18650.
UPGRADE!!! Nice :) If you can save any amount of money on a project and you either made it equal to or better than the expensive one, it's always a good thing. I like that you used the metal tabs that are specifically for that project.
I just bought a new battery pack for mine and moved the batteries into the original case cause the new battery case was thin plastic and cracks easily. Works like a charm and was under $30 Canadian.
To clear up some things in here: Short: Don't do this! It's a waste of money and time. Long: This PCB has NO balancing! Genuine batteries has balancing because not all batteries will be charged 100% the same. This happens because the resistance to charge the second or third line of the pack is higher than the first one. So the charger stops charging because he thinks it's full. But if you check the cells the first line has maybe 4.2v as it should have. But the second or third has only 4,1v. Now the battery will be discharged and the discharge causes this dispersion to grow. For example the first row is at 2,7v and the second 2.4v. After a while with charging and discharging some cells will be discharged so badly, that the charger is not able to charge the pack anymore and some cells are going to be dead after a short time. If there's a way to balance this you could also make 20ah makita battery if you want. The problem is to make a chip which will be accepted by the original charger. Hope you understood and sorry for my bad English
Technically you are right, but (and its a big but), I think you'll find most Lithium Ion battery packs don't have cell balancing, and certainly this type of Makita battery has been manufactured in the countless millions. To ensure you have a pack which lasts you should make sure the cells voltage is very close to each other (say 0.02V delta) before welding the pack. PS this pack is still going strong. It gets used daily.
Very interesting video. You can give an indication about the spot welder you used and possibly the link as for the other components. Thank you very much for your time.
Currently would be considered too expensive. The shell costs £10. You need 10 batteries which would be for cheap ones £2 each. (£20). Where as you can buy one ready made for £18 6AH.
@@PowerOn- i think what silverfox meant was, why buy aftermarket parts to build a battery pack when you can buy an aftermarket/clone battery pack already assembled for cheaper price.
You can do this only if you know lithium ion 18650 1. charging-discharging limits 2. measuring each battery resistance and capacitance 3. knows how to use battery charger with balancer. 4. use of BMS 5. proper way of assembly from the result on the items (1234) listed. no hot glue. 6. Professional balance charger/discharger must have as a tool like the IMAX B6 sky RC.(for you to monitor each cell inside the battery pack) 7. don't use charger without a balancer.
Could you tell me if you think it's possible to desolder the yellow part from an aftermarket PCB and resolder to a damaged Makita battery? I'm considering having a go at it as I have 2 X 1840B batteries with broken yellow terminal bits. Thanks in advance Great video 👍🏼
It aint that simple! You still dont know if you can charge this battery with a standard 9 Amper Makita charger, or it will overheat? Many of the aftermarket batterys can only be charged up to 4 Ampers. It depends on the cell, you used. Another question is , how do you know that the control circuit matches the parameters of the cells youve chosen? Overcharge, overdischarge, max current values???
Hi Gerg, thanks for you comments, It's a while since I did this project and I should have given more information on the choice of the cells. You are right, the cells need to be suitable! I choose the Sony VTC5 as this is the cell often used in these packs. They have a max discharge rating of 20A each so with 2 in parallel that's good for 40A (or roughly a beefy 720W tool). As for charging there is a thermistor on the BMS board. The BMS board will also be protecting the various over and under voltage limits (usually 4.2V/~2.8V. Finally, The cells will easily cope with the 9A from the charger (4.5/cell)
hi simon, i am very curious about making some 5Ah battery by myself but also need to know how long the lifespan of that pack is. so my question is: is the battery pack still running without any loss on capacity or damagin my equipment? greetings, markus
The pack I built is still fine, the lifespan is going to be dependent on the quality of the cells and how often you recharge them. Power tools are very hard on battery packs for 2 reasons. 1) High drain when using the tools and, 2) High charge rates. Cells for tool packs are specified to have high rates of charge and discharge for this reason. As a result their charge density is lower than the very best cells (~3500mAh) currently available. If you are in Germany, try nkon.nl for a reliable source of cells
My only concern is that the chinese pcb:s are of the older Makita type that doesn´t have cell balancing, Makita had a lot of problems before they changed the pcb.
Filip5025 That is interesting. I did not realise the newer Makita drill packs now incorporate cell balancing. I'll keep my fingers crossed someone makes an aftermarket version i can afford 😀
You use new and proven cells in your pack so I don´t think you will have any problems, what I´ve heard it´s when the batteries are used hard and instantly put in the charger the most problems occurs. This is a pic of the new Makita board: i.ytimg.com/vi/_sl0TRAQJCo/maxresdefault.jpg
Quite possibly. 18650 batteries are 18mm diameter and 65mm long hence 18650. If there is any marking on the sleeve try look them up on the internet. Also it's definitely best to test each cell before using in a battery pack.
seems to me that the $25 you saved to make a battery without a guarantee or factory safety could have been made by putting your time toward another money making project.
Salvaste mi vida, compré ese pack y no tenia ni la menor idea de como armarlo, en realidad pensé que estaba comprando una batería completa. Muchas gracias
Gracias por el comentario Rene, aunque tuve que usar el traductor de google !! Me alegro de que haya sacado información útil del video y tal vez haya podido armar un paquete usando algunas celdas de litio 18650.
Thank you for the good explain. you explain very good, not to fast or to slowly.
Thanks for the feedback Fred
UPGRADE!!! Nice :)
If you can save any amount of money on a project and you either made it equal to or better than the expensive one, it's always a good thing. I like that you used the metal tabs that are specifically for that project.
I just bought a new battery pack for mine and moved the batteries into the original case cause the new battery case was thin plastic and cracks easily. Works like a charm and was under $30 Canadian.
To clear up some things in here:
Short:
Don't do this! It's a waste of money and time.
Long:
This PCB has NO balancing!
Genuine batteries has balancing because not all batteries will be charged 100% the same.
This happens because the resistance to charge the second or third line of the pack is higher than the first one.
So the charger stops charging because he thinks it's full.
But if you check the cells the first line has maybe 4.2v as it should have. But the second or third has only 4,1v.
Now the battery will be discharged and the discharge causes this dispersion to grow.
For example the first row is at 2,7v and the second 2.4v.
After a while with charging and discharging some cells will be discharged so badly, that the charger is not able to charge the pack anymore and some cells are going to be dead after a short time.
If there's a way to balance this you could also make 20ah makita battery if you want.
The problem is to make a chip which will be accepted by the original charger.
Hope you understood and sorry for my bad English
Technically you are right, but (and its a big but), I think you'll find most Lithium Ion battery packs don't have cell balancing, and certainly this type of Makita battery has been manufactured in the countless millions. To ensure you have a pack which lasts you should make sure the cells voltage is very close to each other (say 0.02V delta) before welding the pack.
PS this pack is still going strong. It gets used daily.
you are 100% right, this is waste of your time. This is only good for the experiment and testing. Aftermarket chip doesn’t work correctly.
That pcb has no balancing. It could be dangerous
Parabéns !este video foi o melhor ,através deste video montei um pack batt reserva,Obrigado!!!
Congratulations! This video was the best, through this video I set up a reserve batt pack, Thank you!!!
Very interesting video. You can give an indication about the spot welder you used and possibly the link as for the other components. Thank you very much for your time.
The spot welder is home made. I have 4 videos which go through the build.....check them out!
I realize it is quite randomly asking but does anyone know a good place to stream new series online ?
@Zeke Benson Flixportal
@Makai Gianni Thank you, signed up and it seems like a nice service :D I really appreciate it !!
@Zeke Benson no problem xD
Is the pack still working and have you checked the individual cell voltage lately
Yes, but i havent checked voltages individually
Currently would be considered too expensive. The shell costs £10. You need 10 batteries which would be for cheap ones £2 each. (£20). Where as you can buy one ready made for £18 6AH.
Ill have to take your word for the 18quid price. Locally my hardware store (Bunnings) lists the 6ah makita at $168. This is about 84 pounds.
@@PowerOn- i think what silverfox meant was, why buy aftermarket parts to build a battery pack when you can buy an aftermarket/clone battery pack already assembled for cheaper price.
If you already have the welder, saving 1/3 or $25 is never a bad thing.
InTnMnNmAz Thanks for commenting. Yes, any saving is good, and also you know that the cells are of good quality
If you don't count your lost time, you're right
You can do this only if you know lithium ion 18650 1. charging-discharging limits 2. measuring each battery resistance and capacitance 3. knows how to use battery charger with balancer. 4. use of BMS 5. proper way of assembly from the result on the items (1234) listed. no hot glue. 6. Professional balance charger/discharger must have as a tool like the IMAX B6 sky RC.(for you to monitor each cell inside the battery pack) 7. don't use charger without a balancer.
Could you tell me if you think it's possible to desolder the yellow part from an aftermarket PCB and resolder to a damaged Makita battery? I'm considering having a go at it as I have 2 X 1840B batteries with broken yellow terminal bits.
Thanks in advance
Great video 👍🏼
It aint that simple!
You still dont know if you can charge this battery with a standard 9 Amper Makita charger, or it will overheat?
Many of the aftermarket batterys can only be charged up to 4 Ampers.
It depends on the cell, you used.
Another question is , how do you know that the control circuit matches the parameters of the cells youve chosen?
Overcharge, overdischarge, max current values???
Hi Gerg, thanks for you comments, It's a while since I did this project and I should have given more information on the choice of the cells.
You are right, the cells need to be suitable! I choose the Sony VTC5 as this is the cell often used in these packs. They have a max discharge rating of 20A each so with 2 in parallel that's good for 40A (or roughly a beefy 720W tool).
As for charging there is a thermistor on the BMS board. The BMS board will also be protecting the various over and under voltage limits (usually 4.2V/~2.8V. Finally, The cells will easily cope with the 9A from the charger (4.5/cell)
@@PowerOn- Thank you!
hi simon, i am very curious about making some 5Ah battery by myself but
also need to know how long the lifespan of that pack is. so my question
is: is the battery pack still running without any loss on capacity or
damagin my equipment? greetings, markus
The pack I built is still fine, the lifespan is going to be dependent on the quality of the cells and how often you recharge them. Power tools are very hard on battery packs for 2 reasons. 1) High drain when using the tools and, 2) High charge rates. Cells for tool packs are specified to have high rates of charge and discharge for this reason. As a result their charge density is lower than the very best cells (~3500mAh) currently available. If you are in Germany, try nkon.nl for a reliable source of cells
My only concern is that the chinese pcb:s are of the older Makita type that doesn´t have cell balancing, Makita had a lot of problems before they changed the pcb.
Filip5025 That is interesting. I did not realise the newer Makita drill packs now incorporate cell balancing. I'll keep my fingers crossed someone makes an aftermarket version i can afford 😀
You use new and proven cells in your pack so I don´t think you will have any problems, what I´ve heard it´s when the batteries are used hard and instantly put in the charger the most problems occurs. This is a pic of the new Makita board: i.ytimg.com/vi/_sl0TRAQJCo/maxresdefault.jpg
Filip5025 Thanks for sharing the photo. I can see the balance 'wires' are on flat flex. Nice.
What is this green checkered board on which you are assembling Makita battery called?
Cut resistant sheet. Can find it at a scrapbooking store.
@@joshtiel2980 Thanks
I have many lithium batteries, and all are the same brand, but I think they are from china, can I use those for the battery pack build?
Quite possibly. 18650 batteries are 18mm diameter and 65mm long hence 18650. If there is any marking on the sleeve try look them up on the internet. Also it's definitely best to test each cell before using in a battery pack.
seems to me that the $25 you saved to make a battery without a guarantee or factory safety could have been made by putting your time toward another money making project.