My cases seem to be not as thick as ActionChuggers pictured above so maybe his weighs a bit more. Now that Gerisplarail mentions it I did have some engines do wheelies going up hills using the converter cases because the counter weighing is off. I helped that out by placing weights inside the case but now that I think of it maybe just removing the counter weight in the back of the engine may work.
I notice that the "C" size engines run better with "AA"'s but that may be due to me using the Energizer Ultimate Lithium AA's. I do notice that performance wise, using real batteries are better than rechargibles. I guess because they are a full 1.5volts rather than the 1.2volt the recharges max out at. Wonder why they aren't maxed out at a full 1.5?
I notice that the "C" size engines run better with "AA"'s but that may be due to me using the Energizer Ultimate Lithium AA's. I do notice that performance wise, using real batteries are better than rechargibles. I guess because they are a full 1.5volts rather than the 1.2volt the recharges max out at. Wonder why they aren't maxed out at a full 1.5?