Battery selection and Replacement
The K2500 uses batteries to preserve its internal memory when the power is turned off. The
original batteries should last up to two years before they need replacing. Replacement is
necessary when the LCD says “BATTERY VOLTAGE IS LOW” during power-up, or when you
notice that the LEDs flash three times instead of once during power-up. Once these warnings
begin to occur, the batteries should be replaced within a couple of weeks to ensure continued
safety of your RAM objects.
To replace the batteries, you’ll need access to the rear panel. Remove the battery compartment
cover, which is located at the lower right corner of the rear panel as you face it. You may wish to
use a small screwdriver. Replace the batteries with three high quality AA size “heavy duty” or
alkaline batteries. A capacitor will keep the memory alive for about 30 seconds while changing
the batteries, so don’t remove the old ones until the new ones are available. Alternatively, it is
permissible to have the power cable plugged in and the power on while changing the batteries,
in which case memory will be retained as long as power is on. Be sure to insert the new
Maintenance and Troubleshooting
User-callable Diagnostics
9-2
batteries in the proper direction (the positive terminals should be pointing out). Incorrect
insertion won’t damage anything but the memory won’t receive any power from the batteries.
Most quality brand-name batteries now have “sell by” dates printed on their package. Carbonzinc
batteries will last for at least a year after installation while alkaline batteries should last for
at least 2 years provided they are installed before the date on the package. Rechargeable
batteries should not be used; the K2500 will not recharge them and their life after charging on
an external charger will be only a few months. Battery life is not significantly increased by
leaving your K2500 on all the time; batteries may even suffer heat degradation if the K2500 is
left on continuously.