The SB-800 lets you put in 4 NiMh (1.2 volt) and normal AAs (1.5 volt). It has a '5th' battery option taking it upto (potentially) 7.5 volts. Has anyone tried putting more power in through the battery compartment - say 12 volts ? I'd only expect the recharge cycle to shorten, not for more power. Just wondering if there is any sort of voltage limiter inbuilt into the SB-800 or if things would fry internally.
#2. "RE: Putting more than 4.8/6 volts into a SB-800" In response to Reply # 0
San Francisco, US
The 5th battery option is for all batteries, so indeed you can put 7.5vdc thru the battery compartment.
The manual also lists the SD7 pack with 6x C-cells (6 x 1.5v = 9v) so you are safe up to 9v. But as was mentioned, it is via the power jack for the SD7, don't know what the safe level is via the AA battery compartment.
I would not push beyond the Nikon spec, if it burns out, it won't be covered by warranty.
What will kill electricals is BOTH voltage and current. Too much voltage beyond what components are rated for will burn them out, sometimes dramatically. Too much current will kill components by overheating, similarly the combination of high voltage + high current will also kill by overheating (power in watts = voltage x current).
Recycle time with AA is reduced by using a battery with a higher peak current output, which is how the lower voltage NiMH can recycle faster than the higher voltage alkaline.
But if you really need to shorten the recycle time, it is best to get a high voltage pack. The cheapest is the Nikon SD8A. Others are Quantum Turbo series, Lumedyne Cycler series, and others.
BTW you won't get more light by changing the supplied voltage.