Stir, the 875 amp-hours were brand new flooded jars. When they died I realized I didn't much enjoy laying in the snow to top them up. Li back then were an arm and a leg and your first born son. When I found out the temperature limitations I looked for an alternative chemistry. I found Lithium Titinate--but they were totally beyond my budget (about 4 times the cost of Battle born).
I live on a limited budget. I decided to try the telcom jars, which, similar to LiFePo4 have a higher voltage. (not as high as li, though).
I apologize if I misinterpreted your bms situation. It appear to me that you planned on not having one in the new bank.