APC Smart-UPS Ultra Lithium-Ion Battery Pack 1UAPC Smart-UPS Ultra Lithium-ion 1U External Battery Pack for extended runtime on Smart-UPS Ultra 3kW systems. Up to 10 external batteries can be connected.
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APC SRTL50RMBP1U-LI APC SRTL50RMBP1U-LI UPS battery Lithium-Ion (Li-Ion) 50 V