Nikon Speedlite SB-800 - Manual (Page 6)

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For your safety
11 Never open the casing surrounding batteries or use batteries whose
casing has been breached as such batteries could leak corrosive liquids,
generate heat or explode.
12 Keep batteries out of the reach of children to help avoid the possibility of
them being swallowed. If a battery is accidentally swallowed, immediately
consult with a doctor.
13 Batteries should not be submerged in water, exposed to rain, moisture
or saltwater unless they are properly protected from the wet
environment. If water or moisture gets inside the batteries, this could cause
them to leak corrosive liquids or generate heat.
14 Do not use any battery that appears abnormal in any way, including a
change in color or shape. Such batteries could leak corrosive liquids or
generate heat.
15 Stop recharging rechargeable batteries if you notice that recharging is
not completed within the specified time to help prevent the possibility of
the battery leaking corrosive liquids or generating heat.
16 When recycling or disposing of batteries, be sure to insulate their
terminals with tape. If the battery’s positive and negative terminals short-
circuit after coming into contact with metallic objects, it could cause fire,
heat generation or an explosion. Dispose of used batteries in accordance
with local government regulations.
17 Non-rechargeable batteries should never be charged in a battery
charger because they could leak corrosive liquids or generate heat.
18 Remove dead batteries from your equipment immediately, as they could
leak corrosive liquids, generate heat or explode.
CAUTION for Batteries
Do not throw or apply strong physical shocks to the batteries as this
could cause batteries to leak corrosive liquids, generate heat or explode.