User's Guide _______________________________________________________________________
174 __________________________________________________________________ M210243en-A
Float Charging
When the charger task enters Float Charge mode, the battery is
considered to be full and the remaining capacity is set to 100 %.
Charging voltage is set to 6.85 V corrected with temperature
coefficient. Current limit is always 100 mA in Float Charge.
If the battery starts to discharge, the charger task enters Normal
Charge mode.
Temperature Protection
The charger protects lead batteries from extreme temperatures by
limiting the charge current or shutting the charger completely off
under certain conditions. This helps to prolong expected battery life.
If QML102 internal temperature rises higher than +50
°
C, the charger
shuts completely off and battery status shows "CHARGE_OFF". Note
that the battery manufacturers strictly forbid charging of their Lead
batteries above +50
°
C.
When logger temperature drops below -20
°
C, the charging current is
limited to 100 mA to avoid unnecessary gas generation. Lead type
batteries do not accept charging energy well at low temperatures. They
lose the excess energy by generating gas. This may shorten battery
life. Normally, 100 mA limit should not cause any problems as the
average current consumption of QML102 is much lower.
