[SpudRider]

A lithium/iron/phosphate (LiFePO4) battery designed for motorcycles and automobiles is designed to accepting a charging rate as high as 14.4 volts. It is normal for the charging system in any motor vehicle to charge batteries at this voltage. If your charging system damages a LiFePO4 battery, it would also damage a lead/acid battery.

However, you should not us lithium polymer (LiPo) batteries designed for radio controlled (RC) vehicles in your motorcycle. These batteries have a very volatile chemistry; they will ignite and burst into flame if the cells are exposed to air.