XS Power D5100 Description The XS Power 12-Volt AGM Performance battery is a six cell, sealed-valve regulated, lead-acid battery. Sealed-valve regulated, lead- acid(VRLA) batteries are manufactured in two types, gel-cell and AGM(Absorbent Glass Mat). The key difference is how the electrolyte is suspended between the lead plates. AGM batteries such as the XS Power 12-Volt AGM Performance Batteries, use a fibrous material to suspend all liquid electrolyte against the plates. Even if the case were ruptured, no acid would leak. In contrast, gel-cell batteries suspend the electrolyte in a gel form and are not necessarily leakproof. General Features: TYPE: 12V BCI Group 51R AGM Battery MAX Amps: 3100A Length: 9.04" Height: 8.19" Width: 5.43" M6 Terminal Hardware Included NOTE: 5100 is standard polarity; 5100R is reverse polarity XS Power D5100 Care of XS Power 12-V AGM Battery Charge voltage is not to exceed 14.4V total for extended periods of time.(5min. max)* The charger used MUST HAVE an automatic shut-off. *Some AGM chargers may climb to a maximum voltage of 15.5VDC for a short period of time(usually less than 5min.) but will resume charging at or near 14.4VDC±.3VDC for the duration of the charge cycle. If you are unsure of your chargers capabilities, contact the manufacturer of the charger