I see the biggest draw back of Li-Ion seems to be that they require specific charger. Don't really want to mess with the charging system of my bike, so I'll just go with AGM.

This battery comes with advanced technology to protect it from over-discharge, the number one killer of all batteries.  If your battery reads near 0 volts, the over-discharge feature has been activated, thus your battery must be charged. If you left your lights on, key on, have a faulty stator, or have a parasitic drain this can easily happen.  Our BMS is designed to disconnect the flow of current in the event of over-discharge (internal disconnect switch is opened).  Many smart chargers will not attempt to charge a low voltage battery (below 9V), including a Battery Tender Jr.  If this happens, the easiest way to charge (and reset the internal switch) your EarthX battery is to use the lithium charger from Optimate (model TM-471 or TM-291) as it has the built-in feature that allows charging of batteries that are below 9V.   With the Optimate, all you have to do is attach the charging cables to the battery (step 1) and then plug the unit into the wall (step 2).  A second method using another brand smart charger is to connect the charger to the EarthX battery as normal, then put greater than 9 volts across the terminals which can be done by connecting a portable jump pack or connecting jumper cables from another battery (a battery of equal or lesser size).   Once the charger sees voltage it begins to charge as normal.  After 5-20 seconds you can remove the jump starter or jumper cables (being careful not to disconnect the charger).  Recharging this battery from the depleted state can take from a couple hours to overnight.