Like the looks of those batteries Harold, but I have a tough time paying $300 every 3 years as I have not had good long term luck with them. The company (Restoration Battery) says you should fully charge them once a month, but not use trickle chargers on them ever. One other note....the battery inside these cases if very very small. Just has a big outer shell, so you are not getting many plates.

Good luck...hope you have better experience than me.