My new to me and used RV came with two 12V House Batteries and would show 10.8 V just a short time after unplugging from shore power, so I knew I had to replace them. Some off brand car batts. Yep, th...
In states with sale taxes, bringing old batteries for the purchase avoids paying sale tax on core. 10% maybe doesn't sound like much, but buys you Hot Dog lunch at Costco. Make it 2 lunches when you bring 2 batteries.