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I have never had any problems with it, as long as i can mechanically lock the light out to avoid parasitic drain. (The GT can mechanically lock out with a turn of the battery tube/cap) I do check the charge of each cell every couple months to make sure they are staying in a balance state of charge, (within 0.15 volts of each other.) and not stored at to low of a charge. Li-Ion cells seem to be happiest stored at roughly 80 ~ 90 % of charge if not going to be used for long times.