How to charge custom lithium ion batteries (without a BMS)

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what's up guys so if you're anything

like me you've probably made some custom

batteries in the past out of old lithium

ion batteries or new ones from China for

a super duper cheap here's what my

existing custom battery packs kind of

look like and you probably used them and

then they you know eventually died or

the voltage got too low and you've been

wondering how do you charge them safely

because you could just hook up you know

the voltage that you need to charge the

battery to the positive and negative

leads and it would probably charge it

but if you do it too many times it can

lead to disaster the battery can short

out and blow up and cause problems so

you'll notice on most professional

batteries that you buy they usually have

a little cable it looks something like

this and that is the balanced connector