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Charge 8 or 10
batteries NiMh :
When I wished to use
a 10 NiMH type R3 batteries I realized that there was no available
charger device available for such 12V pack. This is how I managed
it:
I got a charger with
two 9V output for batteries 6F22. With a 4 pins plug, I made
the hereunder cable and connections.
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- Batteries and rechargeable ones
Verify the needs:
The receiver of radio remote
control needs 6V. I use a CR-P2 lithium battery which
weights only 35g.
The tension of cameras and modules
range 5V, 6V, 9V, or 12V. It is advisable to be the most
homogeneous as possible. It is possible to feed a camera
or an emitter in 9V with a 6F22 battery, light, but the
lifetime is short. The rechargeable batteries 6F22 are usually
delivering only 7.5V and are not convenient.
The solution that I recommend for
the camera and the emitter are rechargeable Cd-Ni
batteries, type R3, also called AAA size, and soldered one
to the oher as a pack: for example, 9 batteries x 1.2V will
deliver between 11V and 9V during more than one hour for
110g weight, whilst 9 batteries type R6 (AA size) would
weight 240g. The NiMH rechargeable batteries are more expensive
than the Cd-Ni ones, their capacity is more important, but
their auto-discharge is high. In both cases a special charging
device is necessary.More and more devices apply to both.
On the contrary, for the video
receiver and the viewer on the floor, do not hesitate
to have a fair battery capacity: batteries R14 or R20, or
batteries for computers, usually more expensive, but more
performing..
Verify
the Ni-Cd batteries:
When the batteries are
empty, wait 24 hours, then with a multimeter controler, check
the tension of each element. It is frequent to find some out
of order. Remove and replace them. They generally have internal
short-circuit. All elements of the same pack should have the
same internal resistance. |
 
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- Battery Li-Ion
These new batteries
are really performing, and also more light. There is for
portable telephones 3.8V batteries with 900mAH capacity,
which dimensions are 67x33x6mm. Set together as a pack of
3 to get 11,4V, it only weights 90g. It must be compared
to a 10 pack of 10 NiMH batteries delivering 12V with 800mAH
capacity, and weighting 160g.
A specific charger
is necessary for LI-Ion batteries. They have almost no auto-discharge.
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