| Must
Read Precautions before continuing to Li-Pol
page |
Handling
precautions and prohibitions for Lithium-Polymer
batteries
General
information
Lithium-Polymer
( abbreviation : LiPo) batteries require particularly
careful handling. Mishandling these batteries
may lead to explosions, fire, smoke and a risk
of poisoning. Don’t series or parallel connect
battery packs since the cell capacities and the
charging condition may be too different. Therefore
, battery packs we supply are selected.
1.
Charging
Charging
voltage : These batteries should charged
with a charger that is specifically designed for
LiPo cells, charging at above 4.25V per cell ,
which is the absolute maximum voltage. It must
be strictly prohibited as higher voltage causes
permanent damage to the cells and causes fires.
Charging
current: The LiPo batteries can be charged
at a rate of max. 1 C (1C corresponds to the cell
capacity). Charging with higher current than recommended
may cause damage to cell performance and safety
features deeply, and can lead to heat generation
or leakage. Our recommendation is to charge only
at 0.5 C rating. This will give all cells in a
pack time to re-format and take a full charge.
Charging
temperature: These batteries shall be
charged within a range of temperature 32 degrees
to 90 degrees. If these batteries are charged
at the temperature out of the specified range,
leakage, heat generation or other damage may be
caused.
Prohibition
of reverse charging : Reverse charging
is prohibited. These batteries shall be connected
correctly. The polarity has to be confirmed before
you make wiring. The reverse charging may cause
damage to the cells which may lead to lose cell
performance, and may damage to the cell safety
which can lead to heat generation or leakage.
2.
Discharging
Discharging
current : The LiPo batteries should only
be discharged at the recommended rating. If the
discharge rate is higher there is a risk of overheating
the battery and shortening the battery life. High
discharging current may reduce the discharging
capacity remarkably or cause overheats. If a battery
is accidentally deep discharged, it will start
to "puff" up and feels like a little
pillow. If this happened discard the battery carefully.
It cannot be saved.
Discharging
temperature : These batteries shall be
discharged within a range of 20 degree to
100 degrees. At a temperature of 20 degrees or
less, the battery will show a significant decrease
in discharge capacity. The battery temperature
during the discharging should not exceed 105 degrees.
Over-discharging
Normally, LiPo batteries start to discharge at
4.2V and terminate at a cut-off voltage of 3.0V.
Discharging these batteries to a point below 3
Volt with no load or 2.7V per cell under load
causes permanent damage to the cells, and this
must be avoided.
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