There's a remarkable risk with NiMH batteries that fortunately never seems to occur, if the contents of NiMH are exposed to air they heat up and go on fire. I've seen it demonstrated when cut open but in practice even when run over by a car and flattened it doesn't appear to happen
LiFePO4 batteries are considered a lot safer than Lithium-Ion or Lithium-Poly etc and are now readily available in cylindrical cell format but proper chargers are still relatively rare (some are just re-badged lithium-ion chargers which are not correct).
If the size and weight of NiMH batteries is acceptable it is currently a preferred solution, I have a lot of them lying around and never had a problem other than repeated over charging reduces their capacity to around 50%, chargers often over-charge them because the small voltage drop used to detect when they are getting warm when fully charged is hard to detect, my chargers only detect it about 15% of the time.
The final make-up of consumer sodium-ion batteries is still to normalise, most (but not all) electrolytes they use are dangerous which is why they haven't got to consumer level yet, if the safer electrolytes are tied up in patents they may never get to the consumer market.
As said, any battery technology is dangerous if not treated with care, a number of people die each year at car auctions where dead batteries are common and they use very fast chargers to get cars going.
LiFePO4 batteries are considered a lot safer than Lithium-Ion or Lithium-Poly etc and are now readily available in cylindrical cell format but proper chargers are still relatively rare (some are just re-badged lithium-ion chargers which are not correct).
If the size and weight of NiMH batteries is acceptable it is currently a preferred solution, I have a lot of them lying around and never had a problem other than repeated over charging reduces their capacity to around 50%, chargers often over-charge them because the small voltage drop used to detect when they are getting warm when fully charged is hard to detect, my chargers only detect it about 15% of the time.
The final make-up of consumer sodium-ion batteries is still to normalise, most (but not all) electrolytes they use are dangerous which is why they haven't got to consumer level yet, if the safer electrolytes are tied up in patents they may never get to the consumer market.
As said, any battery technology is dangerous if not treated with care, a number of people die each year at car auctions where dead batteries are common and they use very fast chargers to get cars going.
Statistics: Posted by pidd — Sun Nov 03, 2024 2:48 am