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.
1. Cyclic 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 less the number of cycles available from the battery.
2. Standby Life
The estimated life under float service of FP type is 7 years at 20oC/68oF; LFP type is 12 years at 20oC/68oF; CFP type is more than 20 years at 20oC/68oF. The float service life is affected by the factors listed above and the number of discharging, the depth of discharging the battery suffers during its life time. The more discharges suffered and the deeper the discharges, the shorter the battery life. The higher the temperature, the shorter the battery life. If the battery temperature remains at an elevated level for an extended period of time, the expected life is reduced by 50% for each 8 to 10oC of constant temperature above 20oC/68oF.