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Old 01-19-2018, 04:31 PM
Special Delivery's Avatar
Special Delivery Special Delivery is offline
Join Date: Feb 2007
Location: League City, TX
Posts: 603
Default New Life for Garmin 696 Battery Pack

Garmin 696 Replacement Cells for Battery Pack

Back story:
Garmin 696 installed in panel for 10+ years with battery installed. Yep, the battery appears to be toast and won't take a charge. When connected to the Garmin wall adapter/charger, the unit functions properly but won't take a charge... sometimes displays "battery missing" and sometimes after a few minutes of "Battery Charging" the unit displays "Charge Error". Opened up the battery pack and sure enough, 3 of the 6 cells measured <.2volts.

A replacement battery pack is $200 so it seemed prudent to at least search for availability of replacement cells. Found a match for all specs: P/N MH-4/3A3800B Qty 6 @ $2.90/ea. plus $11.39 shipping.

So there ya go... for less than $30 and some labor, you too can give new life to your Garmin 696 battery pack.
R. E. "Ernie" Butcher
Friends of the RV-1/Eagle's Nest Projects
"Mentors build the student...
Students build the airplane." -Glen Salmon

Dedicated to the historical preservation of the RV-1 Aircraft
and organized for the purposes of promoting, supporting,
fostering, and engaging in aviation and aerospace education.

Last edited by Special Delivery : 01-19-2018 at 08:52 PM.
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Old 01-19-2018, 05:34 PM
RV10Man RV10Man is offline
Join Date: Jan 2005
Location: Oklahoma City, OK
Posts: 1,095

I had to solder in a new internal battery in one my 295s. Found the battery on Amazon, Garmin "didn't have one".
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Old 01-20-2018, 03:21 PM
XPPilot XPPilot is offline
Join Date: May 2012
Location: Dallas, TX
Posts: 204
Default New Life for Garmin 696 Battery Pack

Let us know how your Garmin 696 battery replacement project went.
- How long new batteries run your Garmin 696
- Do you get any alarms with new batteries
- Does replacement batteries weight the same as original batteries
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Old 10-06-2018, 12:32 PM
XPPilot XPPilot is offline
Join Date: May 2012
Location: Dallas, TX
Posts: 204
Default Garmin 696 Battery Missing

Found this from YouTube:
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Old 10-08-2018, 10:55 AM
Eagleflip Eagleflip is offline
Join Date: Jul 2007
Location: Yorktown, VA
Posts: 57


how did you get the original battery pack open to replace the old batteries? Mine appears very well sealed and I don't want to mess it up by opening it cave man style...
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Old 10-08-2018, 12:18 PM
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DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,296

I've rebuilt a couple of 696 battery packs. Getting them apart just takes patience and popsicle sticks. After that, it's fairly simple. The cells are not difficult to source. In fact, I bought the last batch as an assembled pack for about the same cost as the individual cells. I just had to add the thermistor.

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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Old 02-07-2021, 01:01 PM
Ercoupechris Ercoupechris is offline
Join Date: Dec 2015
Location: Fredericksburg, VA
Posts: 1

Do you know the specification of the thermistor. I bought a new battery pack but the thermister was glued to the old battery pack and was damaged when I tried to remove it. Thanks
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Old 02-07-2021, 06:35 PM
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emsvitil emsvitil is offline
Join Date: Oct 2019
Location: SoCal
Posts: 476

Measure the resistance of the thermistor at various temperatures and you can probably figure it out.

Or post results, and somebody here can figure it out.
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