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If this occurs, let the cartridge cool off for a while. Then re-insert it and try to charge it once more. 0 When you charge a new battery cartridge or a battery cartridge which has not been used for a long period, it may not accept a full charge. This is a normal condition and does not indicate a problem. You can recharge the battery cartridge fully after discharging it almost completely a couple of times. 0 If you wish to charge two battery cartridges, allow 15 minutes between chargings on the