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Outcome:- Went to Jaycar and decided that the 6V battery was the one I wanted. It was the right physical size and capacity and only $19.95. Any 12V battery which was the right physical size was too low in capacity and at least $10 more. And they had a little 6V charger for $19.95 as well. So I have those. The battery has been on the charger overnight so I can check its fully charged voltage. I want to check that putting a protection diode in place doesn't drop the voltage too far. I read that some people had problems if the input voltage dropped too far below the nominal 6.5V. All being well, I'll add a 500mA fuse as well and be in business. Just need some way of carrying the battery. Usually it will hang off or sit under the tripod. I might want to sling it around my neck, but under such short exposure applications I have a set of rechargeable AAs that took hundreds of shots on several occasions before they started to show signs of draining.
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