Retrotec DM-2 - Manual (Page 9)

Page 9 of 72
©Retrotec Inc. 2012
the contacts are secure against both the positive and negative ends of each battery.
3. Replace the battery compartment panel and securely tighten the screw.
4. Plug the AC power adapter into a wall outlet and into the DM-2 DC power receptacle.
5. Turn the gauge on.
6. Allow the batteries to charge until the charging is
complete (according to the battery status indicator).
This may take up to 24 hours.
Caution: Do not open the panel labeled “No User Serviceable Parts Inside. Do Not Open.” Doing so will
void the calibration and warranty.
1.2.2 Charging batteries
The batteries can be charged in the DM-2 with the AC power adapter, or in a compatible battery
charger. The batteries should be charged for at least 8 hours each time. To completely charge the
batteries, prior to using the gauge for the first time, 24 hours may be required. If the battery charge
indicator is not moving then chances are the Setup needs to be set to “Rechargeable” under “Battery
Type”. When "Not Rechargeable" is selected, the batteries, regardless of type, will not be charged.
Attempting to charge non-rechargeable batteries can cause the batteries to leak, permanently
damaging the DM-2.
The DM-2 includes the ability to recharge the batteries inside the gauge. The batteries will not start
charging if the DM-2 is not turned on first (i.e. you must turn on the DM-2 first, and then plug in the
AC power supply to charge the batteries).
1.2.3 Operating on Rechargeable batteries
It is recommended that the gauge be used on battery power when possible. When battery power is
insufficient to power the gauge, the warning message "Battery Too Low" will appear on the screen.
To prolong battery life, recharge the batteries only when they reach ¼ power
(displayed on the battery status indicator). Do not operate the DM-2 with the
AC power adapter or the Umbilical power cord attached after they are fully
charged; this will significantly shorten the lifespan of rechargeable batteries. If the DM-2 must be
operated with AC power, remove the batteries to prevent the shortening of the battery lifespan. The
batteries are fully charged when the battery indicator is solid black. Allow the batteries to occasionally
discharge completely to improve battery life.
The standard NiMH batteries that are included with the DM-2 should last for two years of constant
use. Extend the life of your batteries by placing them in a quality charger every six months.
1.2.4 Rechargeable or non-rechargeable (alkaline) batteries
Non-rechargeable batteries can also be used, but the charging circuit should be disabled to prevent
accidental charging. Charging an alkaline battery may cause it to explode or leak.
1.2.5 Replacing batteries
Batteries must always be from an identical set where all batteries have exactly the same history. Do
NOT use mismatched batteries. Usually, rechargeable batteries are used and the Setup menu must say