View single post by Robert
 Posted: Tue Jan 2nd, 2018 10:43
Robert



Joined: Mon Apr 2nd, 2012
Location: South Lakeland, UK
Posts: 4066
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 There has to be a substantial electrical connection, it needs to pass, without resistance, at least 4 amps @ 10 Volts without delay, the shutter capacitors depend on it. That's why the D1 used to fail to fire the shutter unless it got all the juice it needed, immediately.

I assembled my first D1 EN4 battery with smaller gauge wire and it didn't work, I replaced the smaller gauge wire with something larger and it worked perfectly. I would get over 1200 exposures from those batteries on the D1 and D1X. That was unheard of, A good, new battery was usually around 300 exposures per charge, from memory.

I think any external battery will need to have a short lead to the camera, since at that voltage and with DC, the voltage drop will be a factor. In fact it may need all six cells of a 12 Volt lead acid battery to get a good response, and perhaps it might be a good idea to have cells in the camera, continuously replenished by the lead acid battery. Although, perhaps that may bring issues with 'over charging'...

One of the links I posted contained the full technical specifications of the 18650 cell and it stated it could produce 30 Amps full load, not sure how long for...



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Robert.