Before I got my Atlas EQG I had a SkyView Pro 8EQ which I liked a lot, in the beginning. But, anyway... I powered the mount with two 6 volt 4.5AH sealed lead-acid batteries, the type used in alarm system power packs. I wired them parallel when in use with the mount and series when charging with a small 1.5-Amp 12-Volt automotive trickle-charger. These chargers are great for maintaining lead-acid batteries while in storage. Unfortunately, the SLA batteries are pretty heavy. But, with the mount drawing say .5-Amp average power they would supply the mount for over 18 hours with no fluctuation. The SVPs RA drive unfortunately does suffer speed inaccuracies from voltage fluctuations. This quality is a deficit for astrophotography. Ultimately, this is the reason I abandoned the SVP for the Atlas. I power the Atlas with a power pack from my daughter's Mongoose 24-Volt electric scooter; two 12-Volt 10AH SLAs. This pack will power the Atlas all night, or at least as long as I can last. And, is easily charged/maintained. The Atlas has much better electronics than the SVP and does not suffer the fluctuation problems the SVP does.