iGEL battery has a built-in chip that monitors in real-time the battery power status and reminds users of maintenance when power is running out, which can be an effective way to prolong the service life of battery. 100% pre-delivery inspection to ensure stable quality and reliable performance. Pb-Ca alloy battery plate grid, low water loss and low self-discharge rate. Complete sealed, maintenance free, low self-discharge rat. Low internal resistance, good high-rate discharge performance. Excellent high & low working temperature performance (-40°C to 60°C). High charge retention, long cycle service life Design float service life: 3-5 years.