VEMCO - VR2AR / VR2AR-X Manual
15 March 2019
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6.4
Batteries
The VR2AR receiver is powered by:
•
AR
– a “D” size 3.6 Volt Lithium battery with a connector attached – the
Tadiran TL-5930/F
•
AR-X
– a “DD” size 3.6 Volt Lithium battery with a connector attached –
Tadiran TL-5937/V
and a Tadiran TLM-1550 4 Volt AA Lithium battery. Specifications for all batteries
are found in Appendices 9.3 and 9.4. Other battery options, including a non-dangerous
goods battery option, are available directly from VEMCO. Contact VEMCO if you are interested in more
information on these alternatives.
The
D/DD-cell
battery powers the functions related to transmitting, receiving, and storing data. Most of the
battery related information in this manual relates to the D/DD-cell battery.
The
AA battery
powers the release motor and contains enough power to allow more
than 100 releases, depending on the amount of resistance given the motor due to
biofouling. The AA battery should never need to be removed and should not be
disconnected at any time.
An important feature of these lithium batteries is their voltage discharge characteristics. These batteries
provide a consistent voltage for most of the life of the battery, as demonstrated with the blue line in the graph
below (D-cell voltages shown). This characteristic allows the receiver to operate at the necessary voltage
levels longer than a battery with a more gradual voltage fall-off. This can be seen by comparing when the
blue and green lines in the graph below cross the red “cut-off voltage” line.
As the graph illustrates, the battery voltage reported by a receiver may be at the correct level for proper
operation even when the battery is close to the end of its life. The voltage value reported by a VR2AR
indicates the battery is at the proper voltage at that moment but does not give any indication of the remaining
life of the battery. For this reason, we suggest you write the date on the battery when it is installed in the
receiver.
▬
= Tadiran lithium
▬
= Alkaline sample
▬
= VR2AR minimum
Do not disconnect
the AA battery.
