I use 3 packs(cheap Gens Ace 4800 saddle lipo packs) and they have lasted over a year now!. Great thing about Lipo cells is that you don't discharge your cells after a race,you just top them up(recommend to charge in balanced charge mode).
Also with Lipo packs if you don't plan to use your packs for a few weeks them your charger should use the storage mode. The packs shouldn't be stored fully charged or flat/low.
Hope this helps.
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