Re: Not entirely true
AGM's also don't generally like being charged all the time, either- that's what usually kills the battery packs on the APC units. Generally what happens is one or more of the batteries in the pack get tired of dealing with the overcharge and go dead open, at which point the pack stops charging entirely, and you lose protection entirely. Given the prices that APC charges for replacement battery packs, I'm more fond of buying a set of replacement batteries and re-building the packs- the downside to that is that you void the connected equipment coverage by doing that. I'm not quite certain what the big 3-phase Emerson-Liebert beasts we use at RedactedCo use, but I don't have to worry about it because we have them on a maintenance contract, and the company we are using is quite reliable..