AND UM-211 Instruction Manual page 6

Be sure to use the device after the battery was recharged. Otherwise that
may avoid from proper use for the device using the battery in emergency.
If the liquid leaked from the specified battery pack gets into an eye, avoid
rubbing it and fully rinse it off using water, then immediately seek medical
attention.
The specified battery pack should be used only on this device. Do not heat
the battery pack, or do not break it up. That may cause a heat generation,
catching fire, short circuit or explosion.
Do not apply a pressure or mechanical shock to the specified battery pack.
That may result in an expansion or explosion.
Replace the specified battery pack with new one when the measurement
time with this device is extremely short even after fully recharging.
English 5