[secant0give]

Recent literature released on Nanotech,s specifically suggests charging only prior to flight to get any longevity out of them. If you leave Nano,s for any period of time with a full charge you will reduce thier life exponentially. I know because I have heaps of Nanos and the ones that I leave flat (3.8 volts) are in excellent condition where the ones I have that I charged straight after use are all but stuffed and they are only 12 months old.
However in my experience standard batteries such as 20 to 30 C ones like Zippies etc, dont appear to be as affected by storing them with as full charge.
A have also noted that the batteries that I charge at 1 C seem to have excellent longevity and hold full charge for long periods, whereas the higher C batteries that you tend to charge at higher rates tend to start to puff a lot earlier and will drop voltage in just a few days and sometimes even only hours after charging..
Gazz

Yep Spot on Gazz and Dave !!
When not in use, leave them at about 3.8V per cell (which is not flat but not fully charged either.) If you can store them in a cool place this helps too.
For Max life, when you use them don't cycle them too deeply, I never take mine below 3.75V per cell and prefer to discharge them to only about 3.85 to 3.9 V per Cell. 3.8 is a good place to aim for!!

Definatly BALANCE charging them at 1C is the go for longest life, I never charge mine harder than 1C.

I have had some Rhino 3S 1350mah packs that have been charged and used almost every day for over two years and they are still going OK except for one that has died. The rest have dropped off a little in capasity but I just set my timer back one min, I flew them yesterday in my zero and this morning in my Depron Extra.

I can't comment much on Nanotecs as I only have one pack but I do have some 40C 4S 1000s and I usually charge them on the morning before flying. If I don't use them I set my charger to put them at storage voltage (3.8VperCell) as soon as I get home. The Accucell 6 from HK has this function and does it just like a charge cycle.

I must say that by sticking to these guidelines, I have got really good life from my packs. I have 8 turnigy 6S 3000 packs that I have had for ages, They fly my big Yak in series and I use them singlely in my Edge 540 and My Ugly stick, They are all perfict and have had much use and are over a year old. They get used every weekend. They are usually charged on Friday at work ready for Saterday's flying

I also have 5 1800 4s Turnigy packs that I fly every weekend and mid week afternoons some times Too. I use them in the Eflight Ultimate I got from Gazz, my funjet and in my little red Yak 54. They have had countless flights and allways come down warm. They are still going well and have only just lost their gilt edge. But they still have plenty of life in them. Same deal with these, I leave them at around 3.8V per cell after flying and charge them the day, or better still the night before flying again.