I just ordered a Lipo charger/booster 5v/1A and I was planning to use them with the lipo I got from store display that Walmart was going to throw out (I got 7 total free, huge 9" or 10" LCD, large lipo pack). The lipo measured about 4" by 4", about 1/8" thick and offers 14.8Wh 3.7v
The charger I just ordered has this:
Also, this board does not possess any undervoltage or other battery protection features, so we do recommend that you use it only with batteries with a built-in protection circuit.
How can I tell if the lipo has the protection circuit or not? Ignore the black tape, it covers up sticky residue from double sided tape that I can’t remove safely.
close up of the part number: https://imgur.com/aaiUwHL
front: https://imgur.com/eaezYBj