Datasheet

Rechargeable Button Cells
4.2 RELIABILITY AND LIFE EXPECTANCY
VARTA Microbattery NiMH Button Cells/Batteries are
safe in normal usage and under anticipated conditions of
unintentional abuse. Protective devices are incorporated
into the cell/batteries to ensure maximum safety. For
confirmation of product safety extensive testing of typ-
ical abusive conditions has been performed. Features
of the high reliability and long operating time at various
applications are listed below and in Fig. 40, 41, 42
and 43:
FIG. 41
ROBUST FAMILY
Trickle charge test at +45°C of NiMH Button Cells
(trickle charge at 0.03 CA)
FIG. 40
ROBUST FAMILY
Life expectancy of robust family
Cycling test by IEC 61951-2
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Long life expectancy:
- Cycle application (IEC): up to 1,000 cycles
- At trickle charge: up to 6 years at +20°C, up to 3 years
at +45°C (up to 5 years at +45°C: V 65 HT, V 150 HT)
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Wide temperature range for standard, high temperature
and trickle charge applications
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High overcharge capability for simple, inexpensive
charging circuits
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Excellent cell balance for robustness and high reliability