Could I use this to power a DVD battery while the DVD battery is in use?
I got this to run my 680, but usually I'm plugged into the wall so this goes unused. However, I often forget to charge the DVD batts for my preamp since they generally last a while, but they were low recently and I had this sitting in the bag, which got me thinking. Can I just set it 9v and plug it into the DVD battery to keep power flowing?
No, looks to me like you can't. I have both a DVD battery and this 18000mah battery, so in order to answer your question, I grabbed both batteries and my multi-meter to test whether it's possible.
Turns out that when you connect the 18000mah battery (set at the proper recharge voltage, which is 12V), the voltage on the ouput connector drops to 0.3V from the 9.25V that it was reading before anything was connected to the input connector. Sorry for being the bearer of bad news...
As an FYI, I assume you saw earlier in this thread that this battery comes with a cable that others have verfied works straight up with the DR680...no custom cable needed.