These batteries are still performing fine for my usage. Rarely plugging in, 35 to 55 A/h removed each night on average, alternator and solar recharging only. Very seldom Schumacher assisted.
Strangely, well perhaps not so strange, is that when the electrolyte levels fall to half way between topped up and the tops of the plates, they hold more voltage.
Like last night with 15a/h removed under a 3.7 amp load, they were reading 12.7 v. I am used to seeing 12.4. It is rare to see over 12.6 once the sun goes down. I've noticed this trend nearly every time. When the electrolyte level falls, voltage remains higher at least until I goto bed, and after topping up it is reduced.
Being afraid to let the plates get exposed again, I will likely top them up soon and watch the overnight voltages suffer again. Perhaps the diluted electrolyte is less corrosive to the plates. Since they still provide all I need overnight, I guess no big deal if I wake up to 12.2 or 12.0.
