building my first battery

[MarkJohnston]

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Battery diagrams for small 12 V light

Hi, I just need someone to look over this very crude diagram if at all possible and tell me if this is feasible build if at all possible. This would be my first battery. I am starting small and hoping there is less chance of something blowing up dealing with smaller voltages, amps, watts, etc...

endless-sphere.com

Maybe it was in the wrong place?

Any other good websites exclusive to Lithium batteries? I need info.

 

[MarkJohnston]

Shoot... I just realized the router adapter is 1.8 A Output!!!! I think that's too much for such a small battery. What do you guys think? But laptops use similar adapters, so I'm not sure

 

[lnanek]

All cells have a specific maximum continuous discharge rating in their data sheet. A Samsung 35E cell can support 8A, for example. If a 2p battery is made from them, then the battery would support 16A, as long as the other components are sized correctly, and there isn't any voltage conversion happening after.

 

[MarkJohnston]

All cells have a specific maximum continuous discharge rating in their data sheet. A Samsung 35E cell can support 8A, for example. If a 2p battery is made from them, then the battery would support 16A, as long as the other components are sized correctly, and there isn't any voltage conversion happening after.

No, this would BE INPUT. I thought I could just charge the battery with any old charger, but this one isn't a trickle charger by any means.

It's strange because I would like to think that a laptop charger would work to charge a lithium ion battery since they also use Li ION. And a laptop battery isn't very many cells in parallel.

I really want a bench power supply, but I don't want to spend $200 for a good one. One of those would solve my problems, also I could possibly revive a dead pack I have here. I like how I can trickle charge with a bench power supply, way better than a hobby charger in my opinion

 

[lnanek]

1.8A isn't a fast charger for LiIon. The Samsung 35e cells in my battery can charge at 2A each:

So a 2p battery made from them can charge at 4A.

I don't think I've ever charged an ebike battery slower than 4A to be honest, since that's my slowest, cheapest charger:

https://www.amazon.com/dp/B087V452R5

My battery is much more than 2p, however, so it can take much more. I think my BMS limits charge to 20A since I bought the cheapest possible. So my BMS is more the limiting factor.

 

[MarkJohnston]

Yeah my BMS says "charging current: 10A". I suppose it will be ok. Perhaps I should make it a 3s3p battery though just to be safe? No idea about the cells though they do seem quality. Just an old battery I used for a long time but I bought it second hand.