The trick to this is to first back the bike onto a 2x4. don't forget to put one under the stand as well. Then, locate the battery which is encased in a black metal box with a hatch on the bottom. Next, unhook the positive power cable (red) and move it away so it does not make contact with the battery, next unconnected the negative on the other side. Then using a 10mm socket unbolt the bolts that are on the bottom front of the case (while facing the side of the bike). slowly tape the front lip of the hatch and the battery should fall out. Then to install the new one. Just do the reverse of this. Making sure that you connect the red terminal first and the black ground wire last.
NO!
FIRST remove the NEGATIVE cable from the battery and then the positive.
On any vehicle, always remove the grounded cable first, and that happens to be the negative on most vehicles. The reason is simple: if you happen to touch ground while removing the grounded cable, nothing happens. If you touch ground and the "hot" cable at the same time while the ground cable is still hooked up, you create a short circuit that can fry the battery, the electrics, or the vehicle.
On the S50, the positive "hot" cable is surrounded by a metal box that's hard to avoid with a socket or screwdriver. It's easy to short out. It could even make contact just by having the battery move around while riding, which is why there is a protective cover there.
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