hello , very new to this hobby , my question is about the trx power pak charger operation , i pluged in a brand new dead battery (ez start 7.2vlt) and the green led flashed for about a minute or so and then went solid wich i believe is fully charged , i dont think this is correct, i also had an old battery that did the same thing, i did try the to start the truck but there wasnt enough power in the battery . any and all help would be greatly appreciated