I have had 4 PC680 batteries over the last 20+ years. All of them have lasted approximately 7 years. I replaced them because they began to crank the engine with a little less vigor. I’ve only used my charger during this time, maybe 6 times total, on all 4 batteries. I fly frequently, so no need. When I need to do maintenance on my avionics, I use a 12V power supply connected downstream of the master relay, so the battery is taken completely out of the loop. Maybe constant charging doesn’t help? I think that turning on your avionics for programming/maintenance, or any other electrical load, while at the same time having your charger connected might lead to the sulfation you are trying to avoid.
I had an EarthX battery on my fourth RV (RV8) And that is an amazing battery in two ways. It will spin your engine faster than what you’re used to, and it is very light. However, it comes at 3X the cost. I only had that wonderful RV8 for a year, unfortunately, so I can’t judge the battery long term reliability, but I assume 7 years is pretty good for any battery. For me, being able to taxi on your starter (EarthX) has no value, and the PC680 starts my engine just fine. The only real advantage of an EarthX is weight. If I can do what my doctor wants - eat healthier, drink less beer, exercise every day, and loose 10+ pounds, I’ve accomplished what an EarthX would do for me, and I’ve saved enough money to buy a new Odyssey every few years for the rest of my life (which will be longer)!
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SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
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