TCW Battery Backup Experiences?
I've had my IBBS from TCW for about 16 months. It's been flying for 20 hours now. During the construction phase, I kept it connected to my main battery and kept both charged.
My startup procedure is to turn on the IBBS system to boot the Garmin system while I put on seatbelts etc. Last flight (flight number 12 or so) the Garmin system was shutting down before I even got my seatbelts on. After the flight I performed a test on the IBBS to see how long it would keep the Garmin two screens and ADAHARS up....about one minute later it started shutting down. I checked the wiring first and all is as it should be so called TCW and sent it back. They said I had a bad cell, charged me $107 and it's in the mail back to me now.
My question is, how often will I have to do this? The lifespan seems awfully short and during flight the efis showed no issue with the backup battery other than a slightly increased voltage at startup which TCW says is indicative of the charging circuit doing its thing. I wouldn't have known the battery was useless if I hadn't tested it...which sorta negates the reason for carrying its weight around.
Anyone else have any experience with this system? I find myself wondering if I wouldn't have been better off installing a standard battery in it's place. Certainly cheaper. I could have bought an odyssee for what this repair cost and if the lifespan of a nickel metal-hydride battery is this short.....why bother?
1,235th flying RV8
SnF Homebuilt Judge
2015 Sun n Fun Kit Built Reserve Grand Champion
2015 Oshkosh Kit Built Champion
2015 Jeffco Kit Built Grand Champion
2014 Oshkosh Outstanding Workmanship Award
Broken Warrior of the Jarhead Clan
Last edited by ColoRv : 04-30-2014 at 01:29 AM.