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want to charge 2 18650 batteries as a 6v battery with a BMS

AlienFirefox

Jan 27, 2024
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I have a flat 6v lantern battery here and I also have a lot of 18650 batteries and I decided instead of paying 30+ dollars for a rechargable lantern battery maybe I can cut this one open and replace the cells with 2 or even 4 18650 batteries and use a BMS to regulate the charging and the voltage, what BMS would be best suited for this one that converts the voltage back into amps would be great but even sticking with 2 batteries would suffice
thanks
 

Bluejets

Oct 5, 2014
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BMS modules do not regulate the charge discharge nor do they allow the charge in the required manner for lithium.
 

AlienFirefox

Jan 27, 2024
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BMS modules do not regulate the charge discharge nor do they allow the charge in the required manner for lithium.
So basically my project is useless unless I charge the batteries seperately
kind of not worth doing then
 

ivak245

Jun 11, 2021
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You can buy a cheap 2,3, 4 or whatever number cells you want BMS online. Connect up a power supply to the input, connect the cells together and then to the BMS, then the load can be connected. I have converted just about every portable appliance I can to use 18650's, some charged by USB, some 12Volts.
 

AlienFirefox

Jan 27, 2024
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You can buy a cheap 2,3, 4 or whatever number cells you want BMS online. Connect up a power supply to the input, connect the cells together and then to the BMS, then the load can be connected. I have converted just about every portable appliance I can to use 18650's, some charged by USB, some 12Volts.
ok
what bms would I need ???
for 4 18650 batteries?
 

AlienFirefox

Jan 27, 2024
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As I already explained, the BMS is not a charger.
its a regulator stops the batteries over charging, as I explained I want to charge them as a 6v battery and it needs the BMS to regulate the current so the batteries dont over charge and burn out.
 

Bluejets

Oct 5, 2014
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Simple module for charging 18650, either one or 2 cells, is as follows.......
You will not charge 2 18650's with 6v or indeed "as a 6v battery" whatever that means.

https://www.ebay.com.au/itm/191943489985
This has nothing to do with your BMS module which can be used as well.

Note that there is an older style with less components around the diode area that are not much chop.

Note also there are many others that will do the same, up to you which you select, this is just one example.
 

AlienFirefox

Jan 27, 2024
13
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Jan 27, 2024
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Simple module for charging 18650, either one or 2 cells, is as follows.......
You will not charge 2 18650's with 6v or indeed "as a 6v battery" whatever that means.

https://www.ebay.com.au/itm/191943489985
This has nothing to do with your BMS module which can be used as well.

Note that there is an older style with less components around the diode area that are not much chop.

Note also there are many others that will do the same, up to you which you select, this is just one example.
I have a charger that charges 6v 12v and 24v batteries
I want to open up my flat lantern battery and replace the dead cells with 18650 batteries and then charge the battery like a normal 6v battery
 

AlienFirefox

Jan 27, 2024
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Jan 27, 2024
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I just bought that board but how exactly am I supposed to wire it up

I will have a closer look when/if it arrives as its from China
thanks
 
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