Datasheet

Rechargeable Button Cells
4.5 STORAGE/HANDLING
Sealed rechargeable NiMH Button Cells from VARTA
Microbattery can be operated in any position.
Maintenance of the cells is not necessary, they are
maintenance-free. However, the cells, like other electri-
cal components, should be kept clean and dry. The cells
complete the manufacturing process in a charged state.
A considerable period of time can elapse due to assem-
bly into battery units, storage and dispatch before they
are taken into service by the customer. Because of time
and temperature depending self-discharge, the state of
charge upon receipt can not be precisely defined. Before
use, therefore, sealed NiMH cells should be recharged.
To ensure long life and trouble-free operation, charging
should be carried out as previously advised. Sealed
NiMH cells can be stored for a long time without
permanently losing capacity. Before storage the cells
should be fully charged and must be disconnected from
any load. The most advantageous storage temperatures
are between +10°C and +35°C, at a relative humidity of
approx. 50%. Cells should be protected from moisture
and contamination.
Before putting into operation, stored cells should be
recharged for 24 hours at the nominal charge rate or at
a smaller current for a longer time. An extended charge
process of two or three normal reconditioning cycles are
necessary after longer storage. In this way the cells are
reactivated and will achieve their “full capacity” i.e. the
activatable present capacity after storage again.
Direct soldering onto the cells can lead to damage.
NiMH Button Cells/Batteries from VARTA Microbattery
are available with different connectors, e.g. ring solder
tags, solder lugs and plug solder lugs for printed cir -
cuits.
Button cells and button cell batteries for printed circuit
board solder application can be flow soldered in the
charged state as long as the soldering time does not
exceed 10 secs. The preheating period should also be
limited to approx. 10 secs. The specified temperature
limits should also be observed with the “Burn-in” tests.
Consult VARTA Microbattery with regard to the compat-
ibility of cleaning materials for printed circuit boards.
For NiMH Button Cells from VARTA Microbattery there
are no restrictions regarding to their operating positions.
In general, referring to NiMH batteries – as for any
battery – please remember:
■
Do not short-circuit
■
Do not damage
■
Do not incinerate
■
Do not handle out of specification
■
Keep out of reach of children. If swallowed, contact
a physician at once