Hi,
I have 10 of the same batteries. I coulnd't find any details on them either. Mine are marked "Energizer", but Energizer doesn't actually make SLA battteries. Anyway, I have been charging them to 14.4V and considering them charged when the current drops to between 1.5 or 2 amps per battery. The hydrometer says they are charged at that point. Mine are 1.5 years old and they seem just fine, but they are still pretty new.
HTH,
Jonathan