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How very sad! We've had a pair of e-bikes before (& can't wait to get better ones), but sure would NEVER, EVER keep it plugged in & charging while we were gone NOR going to sleep. I just figure they did that due to the 2 something AM time of the early morning that it happened.
I have two cheap high-intensity LED flashlights, one of them a corporate freebie.
These devices are not supposed to be left on the charger indefinitely! One of them has an indicator light that turns green, alerting the owner to unplug it...if the owner is around/awake/conscious to do it. The other one stays red and the instructions actually advise people to charge up to about 8 hrs IF THE DEVICE IS FULLY DEPLETED. Topping up the charge level is much vaguer, something about giving it UP TO 8 hrs charging in a month regardless of use.
Sometimes I deliberately discharge the thing till it is obviously weakening, and then charge for 5 to 8 hrs, and only if I am not gone all day. I feel the device partway through for any sign of heating up.
Early adopters are the Beta testers for tech. I will be a buyer after they work out all the kinks. Looking forward to it, but I don't want to be a Beta tester.
As with hoverboards, e-bike batteries have caused fires and concerns.
Early battery construction was poor, with glued-together cells and poorly spot-welded connecting strips (no fusing). Many low-ball-pricing vendors still sell these batteries.
There's been some safety-related progress in the industry, similar to other lithium-powered systems (phones, power tools, etc.). Better batteries are at least now meeting the UN 38.3 certification, and IIRC, Bosch batteries are U.L. listed.
Nearly always this happens when someone uses a 3rd party charger for their bike that isn't matched up properly, or w/ home built batteries. It's not something I worry about at all. Sure, any battery could short, but it rarely, rarely happens. If you look at all the eBikes that are around and throw out the home built and incompatible chargers I mentioned, the amount of batteries that catch fire is extremely low.
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Probably didn't help that the owner also kept a GAS scooter in the same apartment!!! Can you say volatiles?
