Ebike Battery Safety and Fires
*This post has been previously published by LEVA and is being republished here for our audience at Electric Bike Report
Edward Benjamin
Chairman, Light Electric Vehicle Association
I have an electric bike in my garage. The battery on that bike contains enough energy to propel my 100 Kilo self, plus the relatively heavy Pedego Stretch Cargo Bike, and whatever cargo I am hauling (often more than 50 kilos of SCUBA gear) at 20 MPH (32 KPH) for …. more than an hour… (I have never actually exhausted that battery.)
The amount of energy needed to push me, my cargo, the bike, at 20 mph for an hour is something any physicist can calculate. I cannot. But I will just say it is a LOT of energy crammed into a battery box about the size of two cigar boxes (or one shoe box, size 13, for those who do not smoke cigars).
And at 20 mph, I am drawing current at a glorious rate (more than 30 Amps) that is heating wires, connectors, circuit boards, and despite a very efficient motor….the motor.
As recently as a couple decades ago, using a lithium manganese battery in such a fashion would have risked of starting a battery fire. Today, on that bike, a fire is extremely unlikely.