joepilot Posted January 2, 2018 Report Share Posted January 2, 2018 $612 with tax for a new one for my 24V J. Word is out how long these things have been lasting, & the prices are up accordingly. Old one almost 7 yrs old. No tender, but regularly flown & FL & CA it's life. Sat 10 days or so last month & start power wasn't crisp. JPI shows 23.1V after sitting 3 days in mild wx. But paranoid about getting stuck. Plus want to have a strong batt if alt quits IFR. 4/11 install of old one ⬇️ Quote Link to comment Share on other sites More sharing options...
Piloto Posted January 2, 2018 Report Share Posted January 2, 2018 Good batteries. My 12V Concorde cranked my M20J at 5F and right away it started. Best performance if charged at 14.2 Volts. José Quote Link to comment Share on other sites More sharing options...
jetdriven Posted January 3, 2018 Report Share Posted January 3, 2018 (edited) follow the manufacturers instructions and do a capacity check. It’s rhe only way to know and really it’s required. Edited January 3, 2018 by jetdriven 1 Quote Link to comment Share on other sites More sharing options...
StevenL757 Posted January 3, 2018 Report Share Posted January 3, 2018 2 hours ago, jetdriven said: follow the manufacturers instructions and do a capacity check. It’s rhe only way to know and really it’s required. Completely agree. Steve Quote Link to comment Share on other sites More sharing options...
carusoam Posted January 3, 2018 Report Share Posted January 3, 2018 Borrow a BatteryMinder, use its desulfating mode... Then capacity test... Chances of any battery lasting that long and be healthy are slim. Great news to share if you find success... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
jetdriven Posted January 3, 2018 Report Share Posted January 3, 2018 Also 23.1v on the bus is likely around 23.5 at the battery. But that’s only about a 25% charge. Try the battery minder for a couple weeks then a capacity test. Then call Aircraft Spruce. Over 500$ is free shipping. A couple cases of oil will put it over the limit. Quote Link to comment Share on other sites More sharing options...
joepilot Posted January 3, 2018 Author Report Share Posted January 3, 2018 Guess I wasn't clear. New one already purchased and installed! After 7 yrs & a few signs, it was time. Not gonna mess with tests that will just prove the obvious. Just impressed on the longevity of the battery. And for $612, hope the new one lasts as long! 2 1 Quote Link to comment Share on other sites More sharing options...
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