Husky MP2500 Manual page 76

If the user tries to use the MP2500 without replacing or recharging the
batteries or connecting an AC adaptor, another warning message will be
displayed and it will immediately turn off again.
If the battery level falls so low as to endanger the RAM contents, the
MP2500 hardware will turn off to preserve the memory, without displaying a
warning message.
Note that flat batteries can recover partially after being switched off,
allowing operation for a short period. This is not good practice, particularly
with rechargeable batteries, as these could become totally exhausted.
8.2.5.4 Idle Timeout
If the MP2500 is left turned on and not used, to conserve power it will emit a
warning bleep and switch off automatically if the keyboard is not touched for
5 minutes (this period may be changed by using the HOT key (see section
11.4.2) or by an application program: see Part 3). When the user turns on
again, execution will continue normally.
8.2.5.5 Power Save
An automatic power conservation system is incorporated which monitors
operation and removes power from circuits when they are not in use. The
MP2500 will enter power save mode automatically whenever it is waiting for
keyboard input or serial input; this has no effect on operation other than
prolonging battery life.
8.2.5.6 Controlling charging
The MP2500 can be used with Alkaline (non-rechargeable), NiMH or NiCd
(rechargeable) batteries. NiMH and NiCd batteries can be charged by fitting
the AC adaptor, but Alkalines must not. Attempting to charge Alkalines will
cause them to leak corrosive chemicals, which are hazardous and will
damage the MP2500.
Charging may be enabled or disabled by the user or by the application.
Refer to section 11.5 for information on using the HOT key to set up battery
charging.
54 H MP2500 System Developer's Guide
USKY