Mantracourt Electronics Limited
T24-SAf Fast Strain Gauge Acquisition Module User Manual
18
Battery Types
Battery Type
Notes
Alkaline
Zn-MnO
2
Pairs of alkaline 1.5V cells are the most common. Use D cells for maximum
life and AA cells where space is restricted.
Example: Varta 4014 (D), Varta 4006 (AA)
Recommend T24-BC2 module
to maximise usable capacity.
Nickel Metal Hydride
NiMh
Most cells are 1.2V so two in series gives 2.4 Volts. These can match
alkaline batteries in capacity but as the charged voltage is lower they do
not match the usable capacity. These batteries self discharge at a faster
rate than alkalines. If charging these cells in circuit precautions must be
taken to ensure that the maximum voltage on the acquisition module is
not exceeded.
Example: GP 270AAHC (AA)
Recommend T24-BC2 module
to maximise usable capacity.
Nickel Cadmium
NiCad
Most cells are 1.2V so two in series gives 2.4 Volts. Three in series can be
used to give 3.6 Volts. These do not have the usable capacity of an
alkaline battery. These are generally only useful if they are to be charged
on a regular basis. If charging these cells in circuit precautions must be
taken to ensure that the maximum voltage on the acquisition module is
not exceeded.
Example:
Recommend T24-BC2 module to maximise usable capacity.
Lithium Primary 3.6V
Li-SOCl
2
Lithium cells can be used but note that the maximum voltage is 3.6 Volts.
Select a cell with low internal resistance.
Example: Saft LS17500 (A), Saft LSH20 (D)
Recommend T24-BC1 module
as these cells usually have a high internal
resistance.
Lithium Iron Disulphide
Li-FeS
2
These can be found at 1.5 Volts and can therefore be a direct replacement
for Alkaline cells. The low internal resistance and high capacity make
these batteries an ideal choice.
Example: Energizer L91
Lithium Ion and Lithium Polymer
LiON, LiPo
These generally start at 3.7V and exceed the maximum allowable voltage.
These are usable if a regulator and charging circuit can be installed
between the acquisition module and the battery. Care must be taken here
that the regulator does not draw too much current when idle so that the
low power modes are not compromised.
Recommend T24-BC1 module.
Power Supply Modules
Lithium Ion /Polymer Module T24-BC1
The T24-BC1 is a battery charger and power supply suitable for the T24 range of 3V acquisition modules. The
T24 Battery Charger is designed to supply a constant 3.3V from a Li-ion Battery while also charging the battery
from an input voltage. The unit comes pre-configured to provide a charging current of 466mA suitable for
VARTA LIP653450. This module also supports additional batteries providing a charge current of 133mA via the
removal of the leaded resistor (non surface mount).
