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Compatible with SRTL3K & SRTL2K2 Smart-UPS Ultra Models. Supports combining up to 10 external battery packs to meet your extended runtime needs. Long lasting lithium-ion last 3x longer life of a traditional lead acid battery. Standard warranty 5 years repair or replace. APC 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.. Features. Number of batteries included. 1 pc(s). Battery voltage. 50 V. Battery technology. Lithium-Ion (Li-Ion). Product colour. Grey, Silver. Weight & dimensions. Depth. 560 mm. Height. 43 mm. Width. 432 mm. Weight. 19.5 kg. Packaging data. Package weight. 24.5 kg. Pack