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Part# 11-04771
MFR Model# GS21


The GS-21 and GS-52 are 9 volt alkaline battery packs. New brand name cells are first tab-welded together and then entirely encapsulated in non-hazardous epoxy. The potting material is added through a portion-controlled pouring process and totally covers the bottom, top, sides, and spaces between the individual cells, virtually eliminating failure-causing air bubbles. All batteries must meet our rigid quality control standards. They are hand inspected for air bubbles in the poured potting material. Finished batteries must pass through a size gauge measuring width, height and depth. They are further tested for proper voltage and visually inspected by the QC department.


  • Weight: .5lbs
  • Size: 2-1/8" W x 3-3/8" H x 5/8" D
  • Type Alkaline Manganese
  • Voltage: 9.0 Volts
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Good Job, ACS Shipped only current battery when it was available.

Michael D
March 2, 2019

Good quality, lasts as expected

Roy S
September 17, 2018

Works fine....old one was fine too but two years old so replaced.

Duane J
August 22, 2018

Item as advertised. Easy to install by owner. Just use the supplied twist on cable connectors.

Dirk S
February 28, 2018

Never had any problems with this battery packs.

February 9, 2018

The correct battery delivered overnight, nice price.

Doug C
December 30, 2017

I have ordered these from Aircraft Spruce since the first ELT mandate. For the first time, I got a bad battery. It was only putting out about 5 volts instead of the 9+ it should have been doing. Had to order another, send in the old one for testing, and still waiting for refund

Ardis A
June 29, 2018

Easy to install. Puts out the right voltage. Have no clue how long it will last. Pretty pricey.

April 5, 2018

Perfect fit

Dwayne Y
October 6, 2017

FAA required battery pack for ELT. It is 6 AA batteries encased in epoxy that EBC and FAA forces us to use to stay legal.

Gary A
September 16, 2017


Q: Is this the correct replacement battery pack to fit an Emergency Beacon Corp, Model EBC-102A ?

Yes, this is the correct replacement battery for the EBC-102A ELT.

Q: Does this GS-21 battery come with certification?

The ELT battery is TSO'd. Manufacturer C of Cs must be requested at the time of order.

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