EnerSys PowerSafe 4DU-13

8V 780Ah Lead-Calcium Battery for Switchgear / Utility / Telecom
Data Center, Uninterruptible Power Supply, Switchgear
Long Shelf and Cycle Life, High Rate Power Delivery, 100% Initial Capacity
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The PowerSafe D range of batteries are designed for telecommunications, utlity and switchgear applications.

PowerSafe DU battery models are designed to handle the demanding float and deep discharges typical for telecommunication applications. They feature proven flat plate lead-calcium grid alloy and they’re the largest amp hour capacity four cell battery in the industry, ranging from 310 to 780Ah. The DU series multi-cell construction shortens installation time and reduces the battery string footprint. In addition, PowerSafe DU batteries are designed with the edge of the plates oriented perpendicular to the rack rails for full plate edge visibility. The dual hole (top/bottom) terminal design allows for easy maintenance.

All PowerSafe D batteries employ a proven Slide-Lock post seal that allows for natural plate growth over time without degrading the seal. The innovative tongue-and-groove jar-to-cover seal provides reliability with a robust airtight seal.

  • Capacity Range: 310 – 780Ah
  • Flat plate, lead-calcium grid alloy, well suited for long duration float applications
  • Proven Slide-Lock™ post seal design
  • Positive and negative posts on each cell allow for monitoring of individual cells
  • Standard UL94 V-0 flame retardant cover and container
  • NEBSTM level 3 certified for systems with a nominal voltage under 80V
  • Application: suitable for installation in network telecommunication facilities
  • 20 year life expectancy in float service at 77ºF (25ºC) ambient temperature
  • Operating temperature: 32ºF (0ºC) to 104ºF (40ºC)
  • Recommended temperature: 68ºF (20ºC) to 86ºF (30ºC)


Volts: 8V
Battery Capacity: 310Ah
Capacity Rate: 8 hr rate to 1.75 volts/cell @ 77°F (25°C)
Length: 42.4 CM
Width: 40.6 CM
Height: 57.6 CM
Weight: 280 KG


  • 0.25” thick positive plates provide long discharge rates and long life
  • Lead plated copper posts - one positive and one negative post per cell
  • Cover - standard PVC UL94 V-0 LOI>28%
  • Container - standard PC UL94 V-0 LOI>28%
  • Separator - microporous phenolic with “Vitrex” glass fiber retainers
  • 1.215 specific gravity nominal at 77ºF (25ºC)
  • Intercell connectors - lead-plated copper, optional tin-plated copper
  • Flame arrestors - included for increased operational safety
  • Proven Slide-Lock™ post seal design


  • Switchgear
  • Utility
  • Telecom


  • The management systems governing the manufacture of this product are ISO 9001:2008 and ISO 14001:2004 certified