The following table gives an impression of service life at different temperatures.
Battery type
Service life in shallow cycling or float use (years)
20°C
25°C
30°C
Start
5
3.6
2.5
Spiral-cell
10
7
5
Semi-traction
5
3.6
2.5
VRLA AGM battery Traction (tubular-plate)
8
6
4
10
7
5
VRLA-gel Sonnenschein Dryfit A200 VRLA-gel Sonnenschein Dryfit A600
5
3.6
2.5
16
11
8
Finally, temperature plays a big part in charging batteries. The gassing voltage and consequently the optimum absorption and float voltages are inversely proportional to temperature.
This means that at a fixed charge voltage a cold battery will be insufficiently charged and a hot battery will be overcharged. See section 4.4. for more information on temperature and battery charging.
2.5.10. Self-discharge
A battery at rest loses capacity as a consequence of self-discharge. The rate of self-discharge depends on the type of battery and temperature.
Type
Alloy
Self-discharge per month at 20°C
Self-discharge per month at 10°C
Start
Antimony (1,6 %)
6 %
3 %
Spiral-cell
Pure lead
4 %
2 %
Semi-traction
Antimony (1,6 %)
6 %
3 %
VRLA AGM battery Traction (tubular-plate)
Calcium
3 %
1.5 %
Antimony (5 %)
12 %
6 %
VRLA-gel Sonnenschein Dryfit A200 VRLA-gel Sonnenschein Dryfit A600
Calcium
2 %
1 %
Calcium
2 %
1 %
When not in use, open lead-antimony batteries must be recharged after no more than 4 months, unless the average ambient temperature is low. Sealed batteries can be left without recharge for a period of 6 to 8 months. When not in use for a long period of time, it is important to disconnect the battery from the electric system, so that no accelerated discharging can take place as a result of current leaks elsewhere in the system.
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