Battery testing double rated voltage? Wuuuh? Solved. 🤦‍♀️

[furcifer]

Yes you read that right. My buddies eBike died so I told him I'd take a look. Tested the battery and I'm getting 116V out.

It's a standard 48V Hailong battery. Before disassembling the battery and getting under the shrink wrap I thought I'd see if anyone knows how this is possible? I'm assuming it can't have a BMS and from the looks of it it doesn't. If the charger failed somehow I don't think it's possible to charge a lithium cell to +200% capacity.
This is leaving me a bit baffled since I can't picture any way to short a battery from 13s to 26s. The origin of the battery is unknown but it doesn't look DIY and doesn't look tampered with. The battery isn't hot but I'm not 100% sure it isn't a ticking time bomb.

 

[harrisonpatm]

Have you changed the battery on your multimeter, or used a different multimeter? When the battery starts to die in those cheaper multimeters, voltage tends to read higher

 

[gromike]

It appears you're VOM is set to measure ac voltage. Set to dc and retry.

 

[harrisonpatm]

It appears you're VOM is set to measure ac voltage. Set to dc and retry.

Ah, yep, didn't even look at the pic. Thanks.

 

[furcifer]

It appears you're VOM is set to measure ac voltage. Set to dc and retry.

FML, I always do this but I usually catch it before I get this far. My brain always wants to think there are more AC voltages than DC so there must be less DC ranges.

 

[furcifer]

Ah, yep, didn't even look at the pic. Thanks.

lol, well at least you didn't take the pic, that guy is a real boob.

Thanks guys.

 

[gromike]

Yeah, I know these things because I've BTDT. More than once!