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12-volt Gel or AGM batteries

If kept in a charged state when unused, the common

lifespan of a 12-volt Gel or AGM battery is up to six

years. After five or six years of float voltage at an

average ambient temperature of 25 ºC, the battery

still retains 80 % of its original capacity. Higher

average temperatures will shorten the lifespan of

the battery. The number of charge and discharge

cycles of a 12-volt battery is strongly correlated to

its structure and quality. Mastervolt’s 12-volt Gel

batteries can take around 500 full cycles of being

discharged down to 20 % and charged back to full


Most manufacturers consider batteries to be spent

at a remaining capacity of 80 %. This does not,

however, mean that the battery has to be replaced

immediately. For example, the battery can still be

used if only 50 % of the battery capacity is actually

required. It is therefore not necessary to replace the

battery after six years or 500 full cycles. An average

use of seven years is perfectly normal for 12-volt Gel

or AGM batteries.

2-volt traction Gel batteries

The lifespan for 2-volt traction Gel cells is at least 15

years and the maximum number of full cycles is 1000-

1500 when discharging to 20 % of capacity. These

batteries are therefore highly suitable for larger

systems that require intensive use and a very long


Lithium Ion batteries

Mastervolt Lithium Ion batteries have a lifespan of

more than 2000 cycles, which is three times longer

than most standard lead-acid batteries. They have an

extremely long lifespan due to aspects such as the

battery management, very low self-discharge, the lack

of memory effect and a discharge of up 20 %.

Determining lifespan

Courtesy of Flying Focus, the Netherlands.

The lifespan of a battery will vary considerably with how it is used, how it is maintained and

charged, the temperature and other factors. Also the type of battery will determine its lifespan.