12V Lithium battery with integrated 5V phone charger

744

07:42:04

I recommand using a protection BMS circuit for the 3 batteries in ~11V (~12.8 when fully charged (Voltage might be different depending on the type of battery)).
The operationnal Amp is a 5V Step-up module. 
!!!This is just a quick build I made to know if it will work on my battery pack. Be careful when using Lipo batteries!!!
Do you have any advice for the build?
Is it better using the first (+) or the last battery (-) for the 5v module?

published 8 years ago

hurz

8 years ago

The nominal voltage for a LiPo cell is more around 3.65V. Take 4.25V as absolut maximum and charge stop inducation.

kendrickxy

8 years ago

Hey thanks for the info, I'll fix it right now :) The Lithium batteries can get messi sometimes with the voltage. I've seen 3.6 written on them, just like 3.7v.

hurz

8 years ago

Thats why I said 3.65V

bsdiceman

5 years ago

I don't understand this circuit

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