On Saturday, July 1, 2017 at 5:12:01 PM UTC-7, wrote:
I know that the lithium iron phosphate batteries should be charged with a different charger than SLA batteries but can a "lithium" charger be used on an SLA?

MDFA, there are quite a few deals on LiFePO4s that include a charger for $15 to $25 more than just the battery.
Use that charger for the new battery and your existing charger for the old SLA / AGM battery.
Charge voltage is similar, "float" isn't.
Jim