These battery packs out-live the originals by about 300%. My original "Worx" battery would, when new, last about 15 minutes and it would lose torque after about 5 minutes. If I charged them and left them unused they would discharge themselves over about 12 hours. These ones have an incredible amount of life and won't discharge if left unused. I would suggest to charge them when you get them, just to top them up.
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