On Tuesday, March 20, 2018 at 9:28:22 AM UTC-7, Charlie M. (UH & 002 owner/pilot) wrote:
I am really curious why they state that.
In general terms, through many consumer battery chemistries, slower charge is better for the total life of the battery.
Some chemistries tolerate higher charge rates with less detrimental effect.

LiPo and Lion tend to be happier with high charge rates than NiCad and sealed/gelled LA.

Some manufacturers of AGM batteries recommend fast charge rates, at least occasionally, to drive the sulfate into solution again. Odyssey is a thin plate battery, their selling point is high charge and discharge rates without damage.