P91-BP36E 36V 2U Extended Battery Pack (4-String) for P91-1500

P91-BP36E is a 36V 2U extended battery pack for the Xtreme Power Conversion P91-1500 online UPS.
Specifications
Model: P91-BP36E (shown as BP36E in Xtreme P91 runtime tables)
Voltage: 36V (per model designation)
Chemistry: sealed lead acid, matching the P91 internal battery
Form factor: 2U rack/tower
Compatible UPS: P91-1500; up to four packs per UPS
Published runtime on the P91-1500: about 33 minutes at full load and 84 at half load with one pack (internal battery alone: about 3 minutes at full load)
Application notes
Pair the P91-BP36E with a P91-1500 when a closet or rack needs runtime well past a controlled shutdown. Packs chain behind the UPS in the same 2U footprint, so runtime grows without changing the UPS. The 4-string BP36E roughly doubles per-pack runtime versus the BP36.
Source: Xtreme Power Conversion published datasheets and product pages. Runtimes are manufacturer estimates and vary with battery age, temperature and load.
Helpful guides: How to Size a UPS · When to Replace a UPS Battery · Common UPS Failure Points and Preventive Maintenance · UPS and battery service
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