New 6v house batteries & main battery losing charge

PinkLeopard wrote:
Aren't you supposed to be able to charge them up to 14+ and when it shows around 12.5 you're supposed to charge them.

Recharge closer to showing 12.0 to 12.2 zone under light load. 12.0 to 12.2 under light load is about 50% charged.
Yes you will be charging at 13.6 to 14.8 volts is normal. Once fully charged the new batteries will rest at about 12.7-12.8 volts with no load or charging.

Lots of good reading here:

The 12 volt Side of Life