... discharge 4.Use of safety Advantage1.The battery is full of power when it’s out of factory, no need to use liquid ... is no flowing liquid (poor liquid), does not leak acid and free Upside down,5.comply with environmental requirements, ease of use,6.the use of ... lead-calcium alloys, battery self-discharge is very low,7.easy storage, less maintenance;8.using ABS plastic shell and valve ...