When I inquired about swapping to Lithium batteries on mine I was told the NOCO Gen 3 I have would work fine with them.
It will "work" with them in that it will charge them, but it WILL NOT charge them to 100% charge level for the Li-ion. I don't say this to bash NOCO (I happen to like the company.) Unless a charger has a selectable program, or is "hard-wired" with a profile adequate for Li-ion, you will never get the Li-ion to true 100% charge. This is just a fact of physics because the higher voltage level of the Li-ion is so high that it would cook a lead-acid battery (boil-out, etc.) if the charger were charging to those levels. So, charging a Li-ion to the voltage cut-off of a smart charger not specifically set up for Li-ion will create a scenario where the charger stops before the battery is at 100%.
NOCO has already introduced a new single-bank garage-use charger with a battery technology setting for Li-ion. It's there to bump up the final stage voltage, otherwise the charger would never properly charge a Li-ion battery. I suspect the next generation of marine charger models will have a similar feature.
Dual Pro says their regular chargers don't support Li-ion either - for the same voltage level facts I point out above. They do offer modified chargers that have been programmed specifically to provide a full 100% charge level for Li-ion batteries (making the charger no longer compatible with lead-acid or AGM batteries).
Bottom line: Unless you have a charger specifically stated to charge Li-ion to 100%, you'll be heading to the lake with partially charged Li-ion batteries. This will mean you will never get the stated Amp-Hours of energy from the batteries because they were never properly charged to 100% before the use cycle began.
