Question for the battery "Gurus", what is the downside of mixing a gel cell with a standard wet cell type? Will I risk overcharging one or the other? Feedback and comments would be appreciated.
Gel cells are among the least forgiving. If the charge rate is too high there will be permanent damage to the cells. It could be done with appropriate switches and adjustments of the charging rate to fit the gel cell.
If the Gel cell battery is free, go for it. If you have to pay, then don't mix.