Martel Electronics BetaGauge 3II - Manual (Page 168)

A-3 Battery Care/Maintenance
CAUTION!
 Do not strike or drop the battery pack. Sharp
impacts or concussions to the battery pack may
result in leakage, heat generation, and bursting.
 Always follow the specified charging temperature
ranges on the battery pack. Failure to observe the
indicated temperatures may cause leakage, heat
generation, and a decrease in performance or
operating life of the battery pack
 After the battery pack has been removed from the
BetaGauge II, store the battery pack in a dry place
within the recommended storage temperature
range. This will help preserve the battery pack
performance and durability, and minimize the
possibility of leakage or corrosion.
 If the battery pack terminals become dirty, clean
them with a soft dry cloth prior to use. Dirt on the
terminals can result in poor contact with the
equipment and loss of power.
 If you detect heat generation or other abnormalities
when using the battery pack, immediately stop
using the pack.