Martel Electronics BetaGauge 3II - Manual (Page 167)

Battery Care/Maintenance A-2
WARNING!
 Do not apply water, seawater, or other oxidizing
agents to the battery pack, as this can cause rust
and heat generation and can result in the battery
pack bursting.
 Never use the battery pack if it is leaking,
deformed, discolored, damaged, or is different
from its original condition. External damage to the
battery pack can be a sign of a malfunction.
 When the usage time for the battery pack becomes
extremely short after charging, its operating life has
ended and it should be replaced.