User Manual

Shelf Life
In general, when lead acid batteries of any type are stored
for extended periods of time, lead sulphate is formed on
the negative plates of the batteries. This phenomenon is
referred to as “sulphation”. Since the lead sulphate acts
as an insulator, it has a direct detrimental effect on charge
acceptance. The more advanced the sulphation, the lower
the charge acceptance.
Table 8 below shows the normal storage time or shelf life
at various ambient temperatures.
Table 8. Shelf Life at Various Temperatures
– 10 –
Brief excursions i.e., a few days, at temperatures higher
than the ranges recommended will have no adverse
effect on storage time or service life. However, should
the higher ambient temperature persist for one month or
more, the storage time must be determined by referring
to the new ambient temperature. Ideally NP batteries
should be stored in dry, cool conditions.
Recharging Stored Batteries
In general, to optimise performance and service life, it is
recommended that NP batteries which are to be stored
for extended periods of time be given a supplementary
charge, commonly referred to as a “top charge”,
periodically. Please refer to the recommendations listed
on page 24 under Top Charging.
Temperature Shelf Life
0°C ( 32°F) to 20°C ( 68°F)
21°C ( 70°C) to 30°C ( 86°F)
31°C ( 88°F) to 40°C (104°F)
41°C (106°F) to 50°C (122°F)
12 months
9 months
5 months
2.5 months