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Unfortunately even rechargeable batteries have a life cycle and eventually fail to hold a full charge. It depends on the battery chemistry. When NOT to Leave Batteries in the Charger.
Even if you leave them in the charger for 3-4 weeks I dont think that will be a problem.
Answer 1 of 3. Truly speaking its actually good for a battery to keep in charge after 100 BUT ONLY FOR 10 minutes MORE. If your charger does trickle charge I would leave batteries in the charger. Press question mark to learn the rest of the keyboard shortcuts.