Posted by supi7 |
Aug 19, 2010 @ 01:49 PM | 2,721 Views
originally posted in batteries forum.
A discussion on another battery testing thread prompted me to rant again about C ratings and battery testing.
During my 6 years of battery testing I kept 2 things in mind: Lipo should deliver minimum 80% of advertised capacity and stay under 140*F during that test.
To my great surprise new tests are done to 150*F or higher and considered acceptable by people whose enthusiastic 50C 2250mAh battery tests and words seem to influence a small crowd of RCG members, and steering them into wrong lipo usage habits, under the pretense of NEW LIPO TECH. I would expect that from some company's marketing department, but not here.
I just got off the phone with TP's Tech Rep, who told me that maximum safe temp for even their newest lipo's is 140*F. Sounds right to me.
I googled Venom Group's lipo MSDS sheets dated June of 2010, they also say 140*F. Looks good.
I spoke with tech rep at MA and he told me 130*F max and at 140*F battery will start to swell. Right again.
I will call FMA tomorrow since they are on EST and ask them about their pack, but I expect to hear similar answer.
All surveyed companies and their tech's seem to know the safety limits of their products, that's great. What about actual discharge tests, why isn't max temperature no longer considered when testing lipos and what brilliant mind is testing them for the "other" guys.
I guess then if I retest our packs without regard for safety rules or...Continue Reading
Posted by supi7 |
Nov 23, 2009 @ 09:47 PM | 3,657 Views
this is a test of a sample 1000mAh, intresting thing about these cells - they seem to improve in capacity as they get more cycles. It took about 3-4 cycles for them to reach advertized factory capacity.
Also the higher the discharge, the more capacity this battery puts out Fig2. (slightly more, but more). This cell is still in the testing stages, I will have to run quite a few more cycles on it to be happy with it.