Maxcom MM426 User Manual page 52

Telephone performance depends on various conditions.
Your distance from a relay transmitter, number and
length of phone calls significantly reduce the battery life.
While on the go, the phone switches between relay
transmitters and such switching also significantly affects
the battery life.
After multiple charges and discharges, it is natural for the
battery to eventually lose its ability to hold charge. Get a
new battery if you notice a significant drop in the battery
performance.
Use only batteries recommended by the Manufacturer.
Never leave the charger connected longer than 2-3 days.
Never keep the phone in excessively hot places. High
temperatures might negatively impact both the battery
and the phone.
Never use a battery that is clearly damaged. Doing so
might cause a short circuit, and might damage the phone.
Check battery installation for proper polarization.
Leaving a battery in places of excessively high or low
temperature will decrease the battery life. The
recommended storage temperature range is between
15°C and 25°C. Installing a cold battery into the phone
might cause the phone to malfunction and might damage
the phone.
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