La Crosse Technology BC-1000U Instruction Manual page 12

NOTE:
Always observe the recommended maximum charging current of the rechargeable

batteries. In general, 200 mA is a recommended charging current if rapid charging is not
necessary. It is definitely safe and optimum to the life of the rechargeable batteries.
It may be necessary to charge and discharge new rechargeable batteries several times in

the beginning before the optimum capacity of the rechargeable batteries can be
obtained. Use the "Refresh" mode after new rechargeable batteries have been used
under load and charged several times in order to achieve the optimum battery capacity.
When the transformer has been plugged into the power source, the version number of

the charger (for example ―37‖) will be displayed first. Then all the segments will light up
momentarily and the ―null‖ sign will be shown before batteries are placed. If damaged
batteries or batteries below 0.9V, are placed into the charging unit, the charger will also
show ―null‖ on LCD.
"null" displayed - No battery or damaged battery
is placed to the charging unit
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