EnerSys Thin-Plate-Pure-Lead (TPPL) products are valve regulated lead-acid (VRLA) batteries made with absorbed glass mat (AGM) construction.

VRLA-AGM type is a recombinant battery. This means that the oxygen evolved at the positive plates will recombine with the hydrogen generated at negative plates creating water and preventing water loss. Absorbed glass mat (AGM) batteries absorb the electrolyte in a fiber-glass mat separator.

An integrated pressure vent aids oxygen recombination and reduces water loss. A porous fiber glass material is used to separate the plates, retain electrolyte at the surface of the electrodes for electron transfer, and allow oxygen migration. High grade acid is used in conjunction with high purity virgin lead for the grids, active materials, and current collectors. The plates are thin which allows more plates per available volume relative to traditional lead-acid batteries.

Markets and applications served by TPPL batteries are telecommunications, cable TV, emergency lighting, load leveling, hybrid electric vehicles, engine start, uninterrupted power supply (UPS), computer back-up, medical equipment, solar power data processing, electronic, defense, aviation, oil and gas industry, and material handling.