And it's a big battery. To lighten things up I installed a lithium-ion battery from BikeMaster (bikemaster.com) that we had on the shelf in the shop. It's not a dimensional match (direct replacements are available), but the smaller DLFP-5ZS unit has ample power for this application. The RC is no longer running lights or even a radiator fan, so the battery just needs to dump enough current to turn the starter. At 1.5 pounds the lithium battery hacked almost 5 pounds off the RC, all for just $90. It doesn't get much easier than that. Actually, it does: Installing BikeMaster's smallest battery, the DLFP-4L-BS, would have saved another 4.8 ounces and costs $20 less.