Li ion safety tips

Hello there! I an doing this post to share tips, knowledge, useful informations to help whomever like me is scared to death to see their house burnt down to the groud. I’m doing myself a 12s6p li ion out of NESE modules to avoid bad soldering as I’m surely not a professional, and I’ll be able to check my battery each few weeks easily. What do you guys do to prevent a fire in your home while storaging the board or charging? Personally I’ll keep it in the basement, and I’m thinking to build a big box out of plasterboard or drywall as its FireProof… will fire blankets be enough for a Li ion fire?

I don’t leave it charging unless I’m in the same room awake. Other than that, not much.

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Ok now a really dumb question but I don’t really know as lots of lads on the forum were scared to a fire of a battery not connected, and not in function, let’s say you leave your board turned off, is it really possible? If I have my battery in the board while not riding could it really take fire?

I think it’s happened but not sure if to anyone on the forum, when it does it’s really rare and means there was likely a fault in the battery pack. You should always be ready to get it somewhere safe if it starts making weird sounds but you really shouldn’t need to worry.

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Untouched and properly cared are Li-Ion batteries not unsafer than any kind of electronics.

  1. Don’t leave the board with charger alone, check for unexpected hot components after charging and riding once in a while.
  2. Motors, ESC, BMS and batteries can be hot but especially the later two (three) shouldn’t be to hot to touch. The ESC can be checked by software (bluetooth app), a regularly hot BMS should get improved cooling (and or battery status checked) and a battery shouldn’t be more than “just warm” basicly.
  3. Hot connectors or wiring are often indicators for bad build design/quality and loose connections (which should be avoided).

You shouldn’t fully charge up and never fully discharge the battery (40-50% charged or ~3,75 V/per cell are ideal for storage) when you plan to leave the board for a while in the closet (storage). You should also make sure that you don’t have silent drain on the battery while powered off (easiest is a loop-key).

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Thanks! Lots of useful informations, one question about the silent drain, I’ll use a Bestech BMS 80A, should I use a loop key anyway?

The E-switch from the bms should be fine, but nothing wrong to check the battery voltage before and after when you happen to leave the board for 1 or 2 weeks once.

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