Very interesting idea! I'm having the same battery life problem with normal SLA battery. My 2year old Lobster only last max 2hrs now.
With good SLA at around 40-50 bucks, I'd be willing to try this lithium batt if it at least doubles the lifetime of the old SLA. I'm not looking for a batt that would last for more than 4hours each session, but more concerned about capacity maintenance over the lifetime of the battery.
Do we need to swab the batt charger as well? My Lobster premium charger is made by Soneil. I believe it has pulse mode charging to remove sulphation which the lithium iron batt is not compatible with.