WorkHorse Sentinel User's Guide
P/N 957-6163-00 (January 2001) page 17
EXTERNAL BATTERY PAC
ENTINEL AD
P
EXTERNAL BATTERY PACK CABLE
MINIMUM 30 cm APART
TO COMPUTER/DUMMY PLUG
Figure 7. External Battery Pack Connection
7.4 Reusing Alkaline Batteries
Because many deployments will use only a fraction of the capacity of a sin-
gle battery pack, you may wish to reuse your battery packs. With experi-
ence, you should be able to reuse batteries successfully, but keep in mind
the following:
• Standard WorkHorse battery packs hold 28 ‘D-cell’ alkaline batteries
with a voltage, when new, of approximately 42 VDC.
• When the capacity of a battery pack is 50% used, the voltage (meas-
ured across the battery connector under no-load conditions) falls to
approximately 32-35 volts. However, keep in mind that this voltage
is not an accurate predictor of remaining capacity.
• Batteries should be replaced when the voltage falls below 30 VDC
(measured across the battery connector under no-load conditions).
• Battery packs differ from one to another.
• If your deployment is important, weigh the cost of a new battery
pack against the risk of lost data.
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