Originally Posted by Moflash
The right charger is the key with this type of battery
While that is so true, when AGMs get depleted in this manner, only proper 'conditioning' will potentially
bring them back to close to their original storage capacity. Without providing these batteries with this conditioning charge, they will re-charge, but to much lower voltage levels than new, providing diminished service.
AGM batteries (and Lifelines in particular), require a bulk/acceptance charge of 14.2-14.3 VDC AT 77ºF
. This is extremely important, as lower voltages are required in higher ambient temperatures and greater voltage are required at lower temps. They should get a float charge at 13.2 VDC, again at 77ºF.
This is the primary reason that even good converters like the PD-9200 series (which do not provide the exact charge voltages needed for Lifelines, but are close)still do not compensate for temperature, but a quality inverter/charger like Magnum Energy does, and also has per-set charging profiles for the different types of deep cycle batteries found on RVs and boats.