opinions about batteries....

[nativepaul]

I still have a set of Tanic 10C cells in use form around 8 years ago when 10C were just becoming available, and they were the only 10C cells that were actually capable of 10C, it was before balancing was generally available and they dont have balance leads as such although they do have 3x taps on so you could charge each cell individually up to the same voltage, they have never been balance charged except for at the factory (I assume), I bought them for a 6s1p EDF plane but for the last few years I have used them as 3s2p in a boat, they are old cells although have been in constant usage and have never been stored. While the voltage is lower than modern cells at around 3.1v@10C compared to 3.6v@10C for modern cells, after many years and hundreds of cycles they are still rock solid, still have good capacity, and get no warmer than much more recent and higher C rated cells do @10C.

[zeropointbug]

THat's interesting, it seems like old school lipo's are made with a more stable chemistry as far as calender life is concerned if what you guys are saying is true.

Anyone else have some old (6+ years) packs that are still perform strong? Post it here.

BTW, a good pack these days will hold a 20C discharge at ~3.7v/cell (at mid discharge) or how about 3.5V @40C discharge.

Graph from everydayflyer from RCGroups.

Originally Posted by zeropointbug

THat's interesting, it seems like old school lipo's are made with a more stable chemistry as far as calender life is concerned if what you guys are saying is true.

Anyone else have some old (6+ years) packs that are still perform strong? Post it here.

BTW, a good pack these days will hold a 20C discharge at ~3.7v/cell (at mid discharge) or how about 3.5V @40C discharge.

Graph from everydayflyer from RCGroups.

Hmm... quite funny I was thinking that my older LiPo's were better than my newer packs somehow. In 2008 I think I bought some Rhino's (at that time they were the high-quality packs at Hobbyking. Is it still like that now?), 1350mAh rated for 30C continious (= about 40A). They've seen lots of 80A+ spikes and the cells reached 2.7V per cell. Now, 4 years later, they're doing nothing in my hobby room with no single cell puffed. And as far as I remember, they always performed awesome during I was abusing them.

I'm very careful with my newer Turnigy packs as I'm afraid one of them will start to burn out of nothing and take out my house as well. So I always put them in a LiPo bag in the garage on a stone floor. But those old and abused Rhino packs lie in my house, without LiPo bag, on a wooden table and I'm very confident nothing will happen with them. It might sound very funny but I'm so scared of my new LiPo's...

[jayjay283]

I leave my neu batterys that are years old and probably more at risk of burning up laying around charged or nearly discharged and not worry about them but this zippy lipo I bought, I can't go to sleep unless im sure that souless SOB is tucked into a lipo sack near the fire extinguisher. Wish I was kidding

[zeropointbug]

haha, put it in a battery recycling bin then.