I know a lad with an original gold case trakpower 4900 stick pack that's now 5 years old.
Last I heard (admittedly about a year ago...) this pack was running fine and had never been balanced in it's life. Wouldn't advise it though.
Personally I balance charge every time at home and sometimes (approx 50%) at the track. I have 1 pack (my only pack) of 18month old IB4200 35c saddle lipo's and they are as good now as when new.
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