... 3.5 x 2.3 INCH Optimize the battery, extend battery life upto 3 times longer or 8-10 years ... 5 x 2.3 INCHFeatures:1. Optimize the battery, extend battery life upto 3 times longer or 8-10 years ... smooth start of the vehicle;4. Stabilize the battery current and voltage, thus protect the vehicle's ... vehicles, but also to all appliances using lead acid battery, like UPS power supply, boat, yacht, solar lamp ...