Thunderpower or Poly-Quest your choice ?

yeah ... "I am look at" oops :-) hehe

FWIW Do not know why, but I have 6 ThunderPower 2 cell units.

2 of them puffed up like pillows. No idea about the Poly Quest units.

will get you the skinny on both brands.

Frankly, unless you need ultra high power to weight, the TP are overpriced.

And the Polyquest brand has had its share of flak too.

have a look at

and as well

And do plenty of research before you spend big$ on something that may be more - or less - than you really NEED.

Today's Lithium Polymer "hi rate" packs are limited to something between 12 and 15C from the tests I and others have made. There seems to be a fair amount of correlation between the amount of voltage dip seen at the beginning of discharge and the damage done to the cells by that discharge. Temperature also plays a key role, packs that rise to over 140 F are subject to significant capacity and cycle life deterioration. What those touting 20C continuous capability fail to tell us (and probably don't have a clue themselves) is the penalty you pay in cycle life when discharging at 20C continuous. Certainly if you are a sponsored F5B flyer, cycle life is inconsequential as you paste the name of the battery on the side of your plane and get a new shipment of packs for every event.

I have a TP 3S-4200 that's well over a year old, been cycled at least a hundred times, and is holding up great. I also have a PQ 3S-1450 maybe 7 or 8 months old that's doing fair, and a PQ

3S-2200 same age that's not holding a charge worth a damn only running with maybe 7C discharge......

Thanks for the tips,