On 27/09/17 14:58, Christopher Havel wrote:
Typing on phone, please excuse top post.
Lithium ion cells are somewhat sedate, but cannot release as much current at once as lithium polymer cells can. Lithium iron phosphate cells are similarly sedare, but have capacities and discharge abilities more like those of lithium polymer cells.
arr didnt know about the quick and high current discharge of li-po vs li-ion. oh and thx for lifepo vs lipo too. thought lifepo could do high dischage but didnt know it was simular to lipo. oow i learnt some more :) thanks
Lithium polymer cells are the ones on YouTube that catch fire (or worse) at slight provocation. They tend to (pick one) melt, catch fire, or explode during recharge, if the parameters are at all even slightly off.
Most phones also use lithium polymer cells, though - usually a single flatpack in a case. These flatpacks need room to expand, whether in a case or "non-removeable" inside the phone. What happened with the infamous Galaxy Note 7 was that the designers did not pay attention to this requirement. The batteries tried to expand, couldn't, and shorted out internally as a result. Boom.
Yea tried to leave/naturally left a little bit of room in my wooden battery box. hmm guess 1,2or3mm total for front and back and 1cm or so along one side with foam to pad/fill the gap. hmm didnt do any calculations for how much space to leave. kinda assumed that i had enough/ wasn’t trying to make it a tight fit but overall compact. using the bits of wood i had for a compact, strong box. its a 4S 20AH pack... http://hobbyking.co.uk/hobbyking/store/uh_viewitem.asp?idproduct=80904
you’ve got me reassessing my decisions... hope its ok... got a temperature alarm with sensor along the side. plus 2x cell voltage monitors/alarms.