I’ve been riding my board for about 2 weeks. Yesterday I left my board on for a couple days by accident and now my board wont charge, plugging in the charger the light indicator on the charger doesnt even light up. I have 2 lipos through a supower bms and whenever i plug in my loop key I get a weird, very soft, siren/alarm like sound coming from the BMS.
Voltage is probably too low to initiate charging. you will need to “jump the pack” by charging with low current at the battery terminals. Once you bring the voltage of the cells above 2.8v the bms should allow charging again. You will need a controllable power source to do this since you don’t want to dump to much current into the pack when the cells are too low.
Of course, check voltages with a multimeter to be sure this is the problem.
… and try not to have to do that too often, cells don’t like that too much, it seems to shorten the lifespan a bit. Obviously shit happens… but you know.
I just saw that you are running li-po… It isn’t to a great idea to run lipo with a bms. Most BMS units, if not all, have a low voltage cut-off far to low for prismatics. Chances are you have puffed your packs and they are now toast.
I just checked the voltages of my batteries the voltages of the first lipo every cell is at 3.4v which is my cutoff in vesc.
My second lipo which is plugged into 6-10 on the BMS is at
2.3v
1.9v
2.9
1.4
3
For a grand total of 11.5v
It originally is a 5s zippy compact 5000mAh 18.5v pack
Do i just buy a new one? Is it safe to try and rescue this pack?
Did you bypass the bms for discharging? Even if you didnt, lipos can self discharge when they get too low, that’s why you see most of us use cylindrical li-ion. They are more stable at low voltages.