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cheeksmear t1_iufc1oo wrote

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

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

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Seyon t1_iufe0ku wrote

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.

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Moddersunited t1_iufo61e wrote

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.

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