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Old 12-22-2017, 10:16 AM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is online now
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 732
Default AGM battery analysis ?

There appears to be concensus that a small AGM battery is the least complicated and most cost effective option for E dependant Ignitioin & FI backup. How should you confirm battery fitness for defined service/mission ? Some suggest HF battery tester, some say drain the battery to 10 volts with a light bulb load and measure time. Is there a device or routinely administered protocol to know if battery #2 is fit for the mission ?
Larry DeCamp
RV-3B flying w/ carb / Pmags / Catto 2b / Steam
RV-4 fastback w/ Superior XP360/AFP/G3X/CPI/Catto3b
Clinton, IN
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Old 12-22-2017, 10:24 AM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,978

I do an annual load test on my backup AGM. 10.5 amps draw (for EFI and EI) and measure the time it takes to go to 9V under that load.

Powersonic publishes various time vs. discharge rates to 9V. This assumes a fresh health battery. They also publish shelf lives without charging and capacity vs. number of discharge cycles, shelf life etc.

Click on any PDF here for full specs:

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 427.8 hrs. on the Hobbs,
RV10 95% built- Sold 2016

Last edited by rv6ejguy : 12-22-2017 at 10:27 AM.
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