GEM I GPG Series batteries are excellent for frequent deep discharge applications and wider range of high-low (-45℃~60℃) temperature operation. GPG Series is using high-quality porous PVC separator and Gelled SiO2 electrolyte, the innovated PVC-GEL technology is supporting GEM I GPG Series batteries with great capability to hold remarkable high-energy and keep extremely low self-discharge rate, with 18 years float service life.