Posts: 46
Joined: Sun Jan 04, 2015 11:38 pm


Sun Jan 11, 2015 4:50 pm

Hello,im working on a project,and i need to make a battery of 3,7v up to 650mAh, i have some batterys of 1,5v,1,2v,3v and one of 3,7v but this has only 250mAh can anyone help me to make the battery?? :geek: :oops:

Posts: 5
Joined: Sun Jan 11, 2015 6:38 pm

Re: battery

Sun Jan 11, 2015 6:43 pm

Why don't you put your [email protected] in parallel ? 3 cells in parallel will make you a 3.7V 750mA.

Posts: 1956
Joined: Fri Feb 24, 2012 1:01 pm
Location: UK

Re: battery

Mon Jan 12, 2015 10:12 am

I'm afraid it isn't easy to join up cells of different types to produce one battery. Adding up the voltages would perhaps produce the 3.7V you're asking for, but the capacity in mAh is difficult to get right and you would probably end up with one of the cells emptying before the others and becoming damaged.

I'd say it's safer to just get the right battery in the first place, but that's more money to lay out unfortunately...

Posts: 128
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Contact: Website

Re: battery

Mon Jan 12, 2015 10:40 am

Different batteries have different charachteristics (voltage, capacity, internal resistance, discharge current and so on).
buy appropriate battery
Twitter: @rgrbic

Posts: 3696
Joined: Fri Jun 07, 2013 12:37 pm
Location: Waterlooville

Re: battery

Mon Jan 12, 2015 10:52 am

If you have something designed to use 3.7v 650mAH then get the right battery (presumably a Litium Ion / Lithium Polymer cell). It is very important to use the right charging circuit for the battery. There is risk of damage, fire or even explosion if you use the wrong charger.

If you are looking for a battery power solution in general tell us more about your application. You can power a Pi from a variety of different batteries if you use appropriate circuits.

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