Browsing Marine how to site... I thought this was an interesting "test" using .2c & .4c charge rate on a Lifeline GPL-31T battery.
https://marinehowto.com/how-fast-can-an-agm-battery-be-charged/"This battery only saw an approx 12 minute difference in a 5.5hour charge period but yes it did charge “faster” at .4C than it did at .2C."
"SUMMARY: In this portion of the testing 50% to 100% SOC, on this AGM battery, the difference between a .4C and a .2C charge rate, netted a 12 minute total charge time difference."
;)
