Battery Life; Minisvp & Minictd; Operation With Bluetooth; Minitide - Valeport miniSERIES Series Operating Manual

0660880d - miniCTD, miniSVP and miniTIDE

6. Battery Life

6.1. miniSVP & miniCTD
The units draw power continuously whilst running. Battery life is calculated as follows:
Alkaline cells have a nominal capacity of 6000mAh.
We assume 77% efficiency, giving a usable life of 4620mAh.
With a 1.5v alkaline C cell, the current drain is 120mA.
4620mAh / 120mA = 38½ hours
Lithium cells have a nominal capacity of 7700mAh.
We assume 66% efficiency, giving a usable life of 5082mAh.
With a 3.6v lithium C cell, the current drain is 50mA.
5082mAh / 50mA = 101 hours (approximately)

6.1.1. Operation with Bluetooth

Using a standard C-cell battery, the MiniSVP/CTD fitted with a Bluetooth logger should have an endurance of
approximately 12 hours continuous operation. Once enabled (mag key removed) the Bluetooth unit is in
continuous transmit mode, even underwater.

6.2. miniTIDE

In continuous output mode, the instrument draws power continuously whilst running:
Alkaline cells have a nominal capacity of 6000mAh.
We assume 77% efficiency, giving a usable life of 4620mAh.
With a 1.5v alkaline C cell, the current drain is 62mA.
4620mAh / 62mA = 7 4½ hours
Lithium cells have a nominal capacity of 7700mAh.
We assume 66% efficiency, giving a usable life of 5082mAh.
With a 3.6v alkaline C cell, the current drain is 24mA.
5082mAh / 24mA = 212 hours (approximately)
In Burst mode, the unit cycles between 'Run' and 'Sleep' modes, making calculations more complex. The table
summarises the battery life in each of the preset patterns:
Mode Pattern
B1 30 seconds per 1 minute
B2 40 seconds per 5 minutes
B3 40 seconds per 10 minutes
B4 40 seconds per 15 minutes
B5 60 seconds per 30 minutes
Note that all battery calculation figures are estimated, and may vary according to deployment temperature
and the inherent battery variability. Valeport accepts no liability for the failure of a battery to last for the
expected lifetime.
© 2019 Valeport Ltd
Alkaline
6 days
21 days
38 days
52 days
64 days
Lithium
17 days
46 days
67 days
80 days
87 days
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