Suggested battery for 4 Cree Q5 Maglite ?(photo inside)

claustro

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Jan 4, 2008
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I converted with success a Maglite for using 50 W Halogen mr16 bulb for scuba purpouse.
I used it with a 16,4 volts Nimh external battery pack but it is too weight!
This is my actual set up: the torch is operating through a reed contact and is possible to choose between 3 intensity.
I would like to convert it for led with 4 Cree q5 leds , Now my biggest concerns are about the batteries.
I only need 90 minutes of autonomy.
2 options.
1)Use an external battery.
- Camcorder battery 7,6 li-ion 6000 mah
- Other options?
2)Use batteries fitted inside the torch.
I'd like to use this setting for the advantage in dimension and weight but I am unable to understand which kind of battery I should use.
I 'm searching for protected c cell but seems very hard to find
Also My Maglite is shortened a little bit ( C cell) , if needed I
am available to buy another one for starting from scratch , in this case is better C or D size? Which dimension?

I'd like to use NiMh I 'm a little afraid of using Li-Ion in a torch that stay on for at least 50 minutes continuously underwater.
I only need 90 minutes of autonomy.
Photos of actual setup



Thank you
 
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