Using Lithium LiFePO4 battery in a "ELK M1 Gold" system?

[mkg]

Did anyone consider replacing the lead acid battery (ELK 1280) in "ELM M1 Gold" system with a lithium (LiFEPO4) battery?
If yes, which battery will you recommend as a suitable replacement?

Thanks!
--Mike

 

[dwalt]

I would be careful. The charging circuit in the Elk M1 is designed for a lead acid battery. Charging a Lithium battery is very different.