Peter has given the first in a series of external presentations organised by TreasurerTony Smithstone.
There follows a short and Somewhat brief summary of the essence of his experiences with different kinds of Lithium batteries since their introduction in the early 90's, and although other types were mentioned Lithium Ion and Lithium Manganese, he stuck mainly to LiPo's.
There is a more comprehensive article written by himself on the following website, so if you missed the lecture or wish to gain more information, take a look:-
Things to do when choosing a LiPo battery:-
Buy from a good source so that you have some comeback.
Check from new that the individual cells have equal voltage, if not return immediately before charging.
Buy batteries from reputable manufacturers and beware cheap import, they may have dangerous chemical traces and be unsafe (Overlander, Kokam etc.).
Pass on/listen to advice at club meetings or when flying.
Buy a decent charger/balancer with discharge facility.
Store all the time at 3.8v (never below 3v or above 3.8v). If higher, a hot environment will cook the cell and make it puff up and therefore dangerous by taking above the max. of 4.2v; at 3v, a cold environment will have the same effect. A battery when dropped to 2.75v or lower will not re-charge.
Charge on the day of use, or as near to, if possible and keep them warm on a cold day if possible (in your pocket for 10 mins), for maximum power output.
Store at 5-10 degrees C if possible.
Discharge occasionally to 3v before re-charging.
Things not to do:-
Never charge above 1C, i.e. 2200mah - 2.2amp. If you do this, expect 400-500charges.
Always try and discharge a pack before disposing, don't dump partially charged, they are potentially dangerous.
It was difficult to catch all theadvice that Peter had to give because, for once, the pub was quite busy and noisy and we were asked to sit in the area behind the main bar. But the talk was very interesting and he is an extremely knowledgeable and able speaker.
The above is a very brief summary so do have a look at his web article, it is full of interesting facts.
Regards, Mike Petty.