La Crosse Technology BC-500 - Manual (Page 10)

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 When the AC wall adaptor is first plugged into the power source,
all the segments light up momentarily and then the version
number of the charger (for example “48”) is displayed.
 If no batteries are in the unit, the “--” sign is displayed (see Figure
5).
 IF ATTEMPTING TO RECHARGE ALKALINE OR CARBON
BATTERIES, IT MAY CAUSE RUPTURE, EXPLOSION OR THE
LEAKAGE OF HAZARDOUS LIQUIDS.
 During the charging process, the “CHARGE” sign is displayed if
any rechargeable batteries are placed into the unit. It is the
responsibility of the user to make sure that the batteries are either
NiCd or NiMH type and not alkaline or carbon batteries.
“--” is displayed when no battery(s) are in
the charging unit.
(Figure 5)