View Single Post
Old Jun 02, 2008, 02:16 PM
CG Bob is offline
Find More Posts by CG Bob
KC8WPF
CG Bob's Avatar
Euclid, Ohio, United States
Joined Sep 2004
3,991 Posts
Batteries 101

More cells = more voltage = more speed
Larger MAh = longer run time = longer charge time

At the LHS where I work, I often compare batteries to the engine and fuel tank in a car. Battery cells are like pistons in an engine, more cells (pistons) usually means more speed; but that depends on things like the motor, prop size, and any gearing. The MAh rating is the size of the fuel tank, a higher MAh rating means a longer run time as well as a longer charge time.

I had some 6 cell 1700 MAh batteries that I run in several boats, all are direct drive from the motor to the prop - no gear or belt reduction is used. In my 1:10 scale Crackerbox, I get about a 5 minute run time. I have a 30" PT Boat with the same props as my Crackerbox, slightly different motors, and I get close to 15 minutes run time. That same 1700 MAh will run the AquaCraft Pirate Ship almost an hour.
CG Bob is offline Find More Posts by CG Bob
Reply With Quote