Chassis Batteries

we’ve owned three coaches since 1986 and have replaced the chassis batteries as needed instead of on a regular schedule. we have the chassis battery load tested on a regular basis.

About every 5 years. Seems to be the max life we can squeeze out of a pair of 12V deep cycles.

8 years? You got a good one. Have it load tested, but personqlly I would replace it rather than get stranded.

Anything over 5 years and you are doing well !

2005 f150 went 12yr then died in a parking lot. I,d change them before the trip.

Since I’m a boondocker I replace the starting battery every three years. I don’t want a starting issue way out there.

If you can 'boost' from the house batteries, I'd wait for the chassis batteries to fail, before replacing them. If you are noticing slow cranking or some other issue--then replace.

If you wish to keep it, carry a spare.

We notice when the batteries will deplete in a shorter time with our normal usage. Normally we can go 4-5 days on batteries and tanks, then we must hook up and dump and charge. when that drops to 2 days we replace batteries.
We bought the coach in 09, and replaced the batteries, we have done it again in 2014, and are almost ready to do it again. Last trip we went 3 days before we were required to start the gen-set.

He's asking about the chassis battery.