DIY 100 watts powerbank : is it worth it ?

[@antononononon]

rosin flux helps solder adhere better onto steel, which is the material used for contact plates on li-ion batteries. it`s good to learn, thank you for the video

[@pandacongolais]

Oh shit ! Magic smoke ! But ? Fake magix smoke ? I would keep two eyes on this thing at any time !

[@technopatosh5029]

Unfortunately, it's real smoke! It didn't cause the batteries to heat up (fortunately) but how can I tell if the balancing circuit is doing its job properly? I was thinking of reassembling and checking the voltage of each battery in a while but dismantling it will be so tedious that I'm wondering if I wouldn't be better off finding another kit...

[@maxl96systems]

@@technopatosh5029 I successfully built the same few days ago, no issues.

[@technopatosh5029]

good to know. Could you give some advices ?

[@maxl96systems]

@@technopatosh5029most things you probably already know :) How to install batteries properly should be obvious when attempting this. Screw down the main PCB at the very beginning, you will forget about it later on. Clip the display cover at the very end, you won't be able to open the case afterwards, in case you forget about the rubber feet for example. Check power button like you did, mine was too long as well, clipped it like you did. If you need to unplug BMS connector you can do it by hand or plastic tweezers. Fix the thermistor on battery, some report overheat protection kicking in due to coil heating up thermistor. If they would screw down the PCB at factory, adjust button size and make display cover removable this thing would be perfect. Electrically I'd say it's solid, couldn't find any problems, not too much heating even at 5A 20V.

[@maxl96systems]

Also when the BMS connector is not seated correctly the circuit will not turn on at all. This is no guarantee that proper balancing is done, I just noticed without the BMS plug it will not even power on.