Most of the time, when you come across a battery that is getting old, the warning sign is that it gets really, really hot while charging. Batteries and battery chargers usually heat up during charging – I’ve handled a lot from tons of manufacturers over the years – but they should be hot, not burning.
Swelling is a sure sign that your e-bike battery has died. Any bulge in the case means that the internal components have degraded to the point that the battery is no longer safe to use or charge.
Leakage is obvious. I hope that if you saw your battery weeping fluid, whether you see a crack or not, you would know that something is not kosher. This is more likely if you have subjected your battery to abuse, such as throwing it roughly into the corner of the garage or accidentally dropping it one too many times.
You may not notice a crack, but if you smell a rotten smell coming from the battery, this is another sign that the battery inside is leaking. Stop using it immediately.
How to tell if your ebike battery is bad: A guide
If your battery exhibits any of these signs, even if it’s just one, you should replace it. As in right now. Do not use it before replacing it and do not let it charge again. Make sure it’s unplugged and don’t keep it plugged in.
Using a damaged battery risks starting an electrical fire, and the last thing you want to do is burn the building down. However, do not throw the old battery in the garage. Recycle that baby. You can find a local drop-off location near you.
Yes, I know it’s a bit of a hassle to take it somewhere special, but if you throw the battery in the trash and it ends up in a landfill, its ghost will come back to haunt you. It’s just science, plain and true.
