Do yourself a favor and search for other threads. Spend some time in the battery forum. It is essential to understand the different technologies and methods associated with our power systems. Anyone just entering the hobby needs to know what keeps our planes in the air or disaster is imminent. This past weekend at our field was a perfect example. A newcomer was flying around rather nicely with his new belchfire .40 and wingthing plane when all of a sudden there was a loud THUD First of all, he never warned anyone he was in trouble. BAD!! The plane went in full throttle just behind the flightline. Always yell, please. Anyway, we picked up the pieces, shook off the dirt and went back to survey the damage. I grabs the battery pack to check the voltage, and voila--there wasn't any I asked when the new batts were charged last and how long. Hold on, here it comes___He told me that the batteries were on the charger that came with his new radio since Thanksgiving! YIKES. Take the time to read about our batteries and chargers. You'll be glad you did_bob