Jerry Hubbell - Explore Scientific VP Engineering
The 8 "C" cell battery pack with the standard alkaline batteries will last approximately 3-4 hours due to the fast drop off in voltage on these cells. The motors will stop working when the voltage drops below 12 Vdc. The mount draws about 400 mA continuous. Here is a link to the Energizer "C" battery data sheet showing the discharge rate.
I, and others would recommend you get a rechargeable battery pack. They make some really small, hi-capacity packs now that are pretty reasonable that will last you at least a couple of long sessions.
Vice President of Engineering
Explore Scientific, LLC.
jrh at explorescientific.com
1010 S. 48th Street
Springdale, AR 72762
Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home
Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Mounts: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras: QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating
Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!