La Crosse Technology RS-900 Instruction Manual page 15

Therefore, user is recommend to place the battery with the highest expected charging
current at Compartment 1 first. To release the restriction of setting charging current, user
shall take out all four rechargeable batteries from the charging unit.
To change the operating mode during charging, one can press the MODE key (for
selecting all rechargeable batteries) or NUMBER key then MODE key (for selecting
individual rechargeable battery). 4 seconds after the last key press the LCD will blink one
time to indicate the end of changing.
When overheating condition occurs (over about 53°C, usually due to too high a charging
current selected), the charging will be stopped immediately and the display will shown
"000 mA", the charging process will only resume once the temperature of the
rechargeable batteries drops to a safe level. If overheat conditions continue to occur, the
rechargeable batteries shall be taken out to cool down and then charged at a lower
current.
When the battery is overheated the
charging will ceases automatically.
"000 mA" will be displayed.
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