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Thank you for the question. This model uses sealed lead-acid batteries: 2 internal 12V/9Ah batteries. The replacement battery cartridge is CyberPower RB1290X2. Battery life can vary based on use, temperature, and how often the unit switches to battery power, but UPS batteries typically last about 3–5 years under normal conditions. Keeping the unit in a cool, dry location and avoiding frequent deep discharges can help maximize battery life.
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