The battery builders club

How-Tos & Esk8 mechanics
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20637

which BMS and charger are you using exactly?

20638

Ride cautiously on it? Iā€™m not sure haha discharging batteries is always difficult unless you can ride it

I always have this issue when I charge a board up and then donā€™t get to ride it haha

20639

Doesnā€™t both the charger and BMS have to fuck up to allow overcharge?

20640

I would think so thatā€™s why Iā€™m confused

@ceasium can you measure the voltage at the charger leads with it plugged into the wall

20641

depends on the BMS and charger in question, what are you using?

20642

Its not really built, is it bad to leave at 43v until its finished?

20643

yes as was previously stated letting it sit at that voltage is very dangerous. at the very least connect it to an ESC and motor and spin the motor for a while

20644

I had a daly bms I got from one of the battery builders on the forum and this charger YZPOWER 42V 5A Battery Charger for Electric Scooter Segway Ninebot Max 36V Lithium Battery Pack 8mm Connector https://www.amazon.com/dp/B08CZNP8QB/ref=cm_sw_r_apan_i_5TFD56C89HD6567GXBRF

20645

is your Daly BMS for 12s or 10s?

20646

10s

20647

I feel like your BMS is faulty, although it might be your charger, have you tested the voltage at the charger yet?

20648

I dont have anti spark connector. How bad would it be to plug in the vesc to set it up, so I can discharge my battery.

20649

not that bad, but you should get some antispark connectors, and donā€™t plug it in too much, keep reconnections to a minimum

20650

Ok thanks

20651

and if you donā€™t own a fire extinguisher, you should.

honestly everyone should.

but especially in cases like this.

20652

The charger is saying 43.3v also.
I have a second multimeter to test the voltage with.

Just to double check this is on the right setting?

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20653

yep, and your charger seems to be faulty. not sure why your BMS didnā€™t cut off charging at max cell voltage though so there may also be a problem there.

1 Like
20654

youre gonna haver to adjust the voltage in it. its really strange that the bms didnt cut off charging.

anyways, if you have your esc and motors, plug your esc into the battery (itll spark without an antispark connector but its fine), run motor detection, and either in the vesc tool app or with a remote keep the wheels spinning till it drains below 42v. You shouldnt store the battery at full either but thats not the end of the world.

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20655

The new multi meter is saying 41.6v.

20656

I would recommend draining the battery until 36V