Moddersunited t1_iuf011x wrote on October 30, 2022 at 8:44 PM

Reply to comment by hblok in Fires from exploding e-bike batteries multiply in NYC — sometimes fatally by zsreport

Don't charge a battery with a bad cell. & Make sure you're using the correct balance plug when charging.

Short of the correct charge profile, doing those two things every time you charge is enough to keep you safe.

cheeksmear t1_iufc1oo wrote on October 30, 2022 at 10:05 PM

How are you supposed to tell if a bike battery has a bad cell?

Seyon t1_iufe0ku wrote on October 30, 2022 at 10:19 PM

Visual Inspection. The most obvious warning signs can be found through a simple visual inspection. Signs of a bad battery include broken terminals, a crack or bulge in the plastic casing, as well as any leaking fluid or discoloration. Sometimes, battery terminals can become corroded.

HAHA_goats t1_iufgbx8 wrote on October 30, 2022 at 10:36 PM

If it burns down your house it's bad.

Moddersunited t1_iufo61e wrote on October 30, 2022 at 11:32 PM

Through the balance plug. A balance plug allows you to individually check the voltage of each cell in a pack. This allows you to balance charge a pack and match the voltage of each cell.

If a pack doesn't have a balance plug it normally has a protection circuit installed for a similar task. Hopefully it will account for errors in judgement. I don't have a hand on many consumer cells but if a battery takes 8 hours to charge at normal charging current I would be extremely suspect of that battery bms or no.