Originally Posted by togaflyer
So a battery question for all. I was at Costco and saw a group 51R AGM battery (you can also get this battery at Advance Auto, etc). 450 cca, 85 amp hours. Battery is 9.25 long and 5 inches wide, weighs 27 lbs. you can get post adaptors to match the wire terminal rings. I already have an Odyssey 925L arriving today (which is an AGM type battery), but made me think for next time. Width is good, expand the tray length 2 1/4 inches. You have over 100 cca over the Odassey. Are there any negatives anyone can think of?
assuming the specs are not inflated, that is about double the amp hours at the same weight as the odyssey. Major red flag. low quality batteries skimp on the thickness of lead plates to save cost and this significantly reduces the amount of times they can be discharged below about 30% before the plate is gone (i.e. fail). If it spends it's life floating at 90%+ capacity this is not an issue.
Ever lift a marine or deep cycle battery? Weight is directly related to cycling longevity.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 12-06-2019 at 12:47 PM.