Thanks for that vital safety tip. Thought 2Amp sounded really high - I know lipos don't like to trickle charge but the default setting is a fire hose! Found the receiver screws you mentioned (easy to miss, even easier to lose), found a tiny Phillips screw driver. Just the top to the case weighs a gram! Removing the entire case looks to cut weight by roughly 4 g. That's about 10% of expected take-off weight. Definitely worth doing! I haven't taken the board out of the bottom half of the case...would you recommend cutting through the small hole in the case to remove the antenna wire. Or maybe just cut through the wire and reattach later? What about the shrink tubing on the end of the antenna? Can it be removed too? Something else is in the shrink wrap- perhaps it's just something to keep the antenna wire straight? Might that be removed to save a bit more weight? I don't think the receiver has a satellite antenna. Once the antenna wire is free it appears the board just pries out. Or is it possibly trickier than it appears? I sent an Email to Hobby Partz tech support about whether the receiver will work reliably at 5V. No reply yet. Also checking about on the RC boards. The Turnigy boosted board seems like a potentially simple and light weight solution.