Anyone have any experience with the Interstate Batteries UL-16HCL? I have 16 of them in series/parallel in a 24-volt system. I recently discovered TWO dead cells. Was wondering IF I can replace just two batteries in the bank. The old ones are almost 5 years old. Will the new ones and old ones "play nice" together? Or do I just have to pony-up the money to replace all 16 to avoid future problems? Unfortunately, some of these batteries got low on water over an extended absence. I presume this is the cause of the premature death of the cells. IF I go with the exact replacement batteries, wiring will be much easier, BUT just do NOT know IF the Interstate brand is comprable to the Trojan brand.