Hello I'm new at this

G

gus

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Nov 7, 2022
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I have been building 12 volt lithium batteries from reclaimed power packs for general use but mainly for my fish finder, light and decoys. I occasionally have a question and hopefully someone here will be able to give me direction. Thanks
 
Welcome Gus, welcome to the addiction... oh BTW I, too, love using batteries for appliances around the house:)
 
Thanks for the response. Have you ever had a simple 12v 3s2p board or group of boards fail: This just happened to me.
 
Being 3S and making for a "12V" system, they probably were overcharged. 3s @ 4.2 = 12.6. Most 12V chargers will push to about 13 or 13.5V. This would equate to about 4.33V or 4.5V per cell. Way over for Li-Ion's.
And a 4s would be too low and waste a lot of capacity. 4s @ 4.2 = 16.8, but most chargers only go to 13.5V, so you'd only have 3.375 per cell. If the charger goes to 15V, then you'd have 3.75V. Still undercharged. However, they wouldn't fail really. Just not have much capacity.
 
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