Battery Design Life
 Battery life depends on a number of key factors. These include:
Operating temperature of the battery;
   Method of charging utilized;
   Actual use of the product i.e.: standby or cycle service; etc.
Cycling life
  Giving due consideration to the above factors, the actual life of a battery in cycle service is dependent on the depth of discharge of each cycle. The greater the depth of discharge of each cycle, the lesser the number of cycle available from the battery.

Standby Life
  The estimated life under float service of FP series is 3-5years at 25+2℃; LEP series in 5-7 years at 25+2℃; CFP series is more than 15 years at 25+2℃, the float service is effected by the factors listed above and the depth of discharge. Basically the more battery discharging is effected. The deeper the discharge is and the higher temperature is, and the shorter battery life would be.