EnerSys PowerSafe DDr Batteries

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EnerSys PowerSafe DDr batteries offer an ideal solution for railroad signal and communication applications. They’re designed with several integral features that not only maximize performance, but also assure the battery will meet even the most stringent quality standards.

Valve regulated lead acid (VRLA) recombinant technology means no watering is required throughout the life of the product, while thicker positive plates help ensure longer life.

In addition, the welded/epoxy, dual post seal design provides the highest integrity seal in the industry. The large copper post design enhances the high rate performance. Cells are encased in dedicated protective steel cans (modules) that maintain constant, uniform compression for the life of the cell. The easy to use integral handles allow for fast, simple installation even in the most difficult locations.

Features and Benefits:

  • Capacity 105 to 500 Ah
  • Lead -calcium alloy
  • VRLA recombinant technology - no watering required
  • Steel can construction offers protection in rugged conditions
  • 100% out of the box capacity

PowerSafe DDr Battery Models: DDr 35-07, DDr 50-09, DDr 50-13, DDr 50-17, DDr 50-21

EnerSys Powersafe DDr Construction:

  • 0.25” thick positive lead-calcium-tin grids minimize corrosion and prolong life
  • Balanced plate design grid optimizes recombination efficiency
  • Advanced Glass Mat (AGM) separator is a mechanically strong microporous glass fiber which offers low electrical resistance
  • Single, one piece container construction sealed from the factory
  • Terminal design includes threaded copper inserts for high rate performance
  • Pressure Relief Valve (PRV) operates

EnerSys Powersafe DDr Installation and Operation:

  • Compact, quick and simple installation process
  • Integral handles for easy handling
  • Low maintenance – no watering required
  • Thick plates, single piece container construction, robust construction for long life
  • Welded/epoxy dual post seal design means zero leaks
  • 100% “out of the box” initial capacity
  • Operating temperature: -4ºF (-20ºC) to 122ºF (50ºC)

Recommended temperature: 68ºF (20ºC) to 86ºF (30ºC)

EnerSys Powersafe DDr Standards:

  • Approved for air transportation (IATA A67)
  • Non-Spillable classification (UN2800)
  • Recognized by UL (UL Standard 1989)
  • The management systems governing the manufacture of this product are ISO 9001:2008 and ISO 14001:2004 certified

Alpine Power Systems provides critical power services on all EnerSys battery offerings. Alpine's certified technician's can provide EnerSys installation, preventative maintenance, monitoring and recycling services nationwide. Contact our call center today for quote requests and technical inquiries.

Additional Details


  • AGM (VRLA)



Downloads & Documentation

See below for documentation relating to this product line that is available to download. To download this documentation, please click on the desired document you’d like to download and fill out the required form information fields. You will be able to view and download the documents upon completion of the download form.

  • EnerSys PowerSafe D Safety Data Sheet
  • PowerSafe DDR Range Summary
  • Standby Power Product Overview