EnerSys PowerSafe EC-21M Batteries

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Engineered to meet the requirements of the power industry, the features inherent to the PowerSafe® EC-21M battery make it one of the best in the market. The EC-21M battery features calcium plates which demonstrate maximized performance in long discharge applications and reduce watering requirements. Extra thick positive grids allow for longer watering intervals and enable the EC-21M batteries to be offered with 100% initial capacity. Standard features like thick positive plates ensure excellent long discharges while the large double hole post provides a stronger intercell connection, assuring maximum electrical integrity. The lead calcium grids also help reduce watering requirement intervals. The EC-21M battery includes a Slide-Lock™ post seal, which allows for natural plate growth over the life of the battery without compromising the seal between the post and the cover. The innovative tongue-and-groove jar-to-cover seal provides reliability with a robust airtight seal. Completing the design are copper post inserts, which enhance high rate performance making the EC-21M battery a leader in the industry.

EnerSys PowerSafe EC-21M General Specifications:

Nominal Ah Capacity: 850

Length: 257 mm, 10.1 in

Width: 279 mm, 11.0 in

Height: 475 mm, 18.7 in

Unpacked: 84.8 kg, 186.6 lbs

Electrolyte only 1.215 S.G.:

35.9 lbs

16.3 kg

3.6 gal

13.5 liters

Additional Details


  • CATV & Broadband
  • Utilities & Switchgear


  • Lead Acid - Flooded

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-DataSafe-Flooded-Lead-Acid-Batteries-Owner-s-Manual.pdf
  • PowerSafe-EA-M-Battery-Performance-Specs.pdf
  • EnerSys PowerSafe EA-M Range Summary
  • PowerSafe-EC-M-Battery-Performance-Specs.pdf
  • EnerSys PowerSafe EC-M Range Summary
  • PowerSafe-SpaceSaver-Rack-Mounting-Systems.pdf
  • EnerSys PowerSafe E Safety Data Sheet
  • EnerSys PowerSafe Standby Power Product Overview