How to boost charge AGM batteries in storage?
The manual for my Lifeline 100 Amp Hour Deep Cycle AGM 12 volt batteries says this: "While in storage, batteries should be boost charged every 90 days or when open circuit voltage drops to 12.5 vol...
Forum Discussion
This is a key factor in determining whether a 20% of amp hour recharge becomes mandatory...
AGM batteries tend to demand 20% amperage the further they are discharged.
For maintenance purposes if power is available try to keep them from 90% to 100%.
At 50% fill, the 20% rule applies strongly.
I've noticed with my (6) Lifelines that the greater the amperage seen at a 14.4 volt limit the faster they will pass through the final 5% of charging. Meaning a 50 ampere initial charge rate improves the speed of the final 5% by more than 10% Less time. I haven't measured it because it is a moot point. Recharging a 50% discharged Lifeline slows down the final 5% to an agonizingly slow pace.
The 20% recharge factor may be one of the top negative issues with absorbed glass mat technology. The final 5% capacity requirement doesn't help it's reputation either. Raising voltage from 14.4 to say 15.0 does not aid much to recover time loss either. It gives me thought of using a wet battery and a DC to DC booster to finish laggard AGMs.
AGM batteries tend to demand 20% amperage the further they are discharged.
For maintenance purposes if power is available try to keep them from 90% to 100%.
At 50% fill, the 20% rule applies strongly.
I've noticed with my (6) Lifelines that the greater the amperage seen at a 14.4 volt limit the faster they will pass through the final 5% of charging. Meaning a 50 ampere initial charge rate improves the speed of the final 5% by more than 10% Less time. I haven't measured it because it is a moot point. Recharging a 50% discharged Lifeline slows down the final 5% to an agonizingly slow pace.
The 20% recharge factor may be one of the top negative issues with absorbed glass mat technology. The final 5% capacity requirement doesn't help it's reputation either. Raising voltage from 14.4 to say 15.0 does not aid much to recover time loss either. It gives me thought of using a wet battery and a DC to DC booster to finish laggard AGMs.
