So You Own An AGM Battery...
AGM batteries can sulfate just like any other lead acid battery. Other than by Ouija Board how would YOU determine if a battery has become sulfated and how severe is the sulfation, and if desulfation ...
Forum Discussion
full_mosey wrote:
Is there proof that more than 14.xV are necessary to fully charge ANY AGM battery? We are talking about an otherwise healthy battery, not one that is damaged due to neglectful charging.
Even Lifeline says to fully charge at 14.3V and then observe a loss of capacity, before conditioning.
HTH;
John
John, it's not necessary but can be done. I have three Enersys AGM's and here is the specification sheet: Enersys AGM EP spec sheetOn page 10 is listed the recovery procedure for a fully discharged battery to retain capacity. It is remarked, "Charge the battery using a 0.05C10 constant current for
24 hours. The charger should be capable of providing
a driving voltage as high as 36V. Monitor the battery
temperature; discontinue charging if the battery
temperature rises by more than 20ºC."
When using a constant voltage charging regimen it is suggested,"In a float or standby application the CV charger should
be set at 13.5V to 13.8V at 25ºC (77ºF). For a cyclic
application, the charge voltage should be set between
14.4V and 15V at 25ºC (77ºF). In both cases, the linearized
temperature compensation factor is ±24mV per battery
per ºC variation from 25ºC (77ºF)."
