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A battery-powered vehicle has a pair of side frames, a cross plate, a pair of dams, a cover plate and a battery. The cross plate interconnects the side frames. The dam is provided on each of the side frames. The cover plate is arranged to overpass the dams. The battery is installed on the cover plat

A battery-powered vehicle has a pair of side frames, a cross plate, a pair of dams, a cover plate and a battery. The cross plate interconnects the side frames. The dam is provided on each of the side frames. The cover plate is arranged to overpass the dams. The battery is installed on the cover plate or above the cover plate.

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1. A battery-powered vehicle comprising:a pair of side frames;a cross plate interconnecting the side frames;a dam provided on each of the side frames;a cover plate arranged to overpass the dams;a battery installed on the cover plate or above the cover plate and a trough provided for a part of each o

1. A battery-powered vehicle comprising:a pair of side frames;a cross plate interconnecting the side frames;a dam provided on each of the side frames;a cover plate arranged to overpass the dams;a battery installed on the cover plate or above the cover plate and a trough provided for a part of each of the side frames.2. The battery-powered vehicle according to claim 1, wherein the trough is a semi-covered trough.3. The battery-powered vehicle according to claim 1, wherein the trough is an open trough.4. The battery-powered vehicle according to claim 1, wherein the trough is arranged at each of the right and left ends of the side frames.5. The battery-powered vehicle according to claim 1, wherein the trough extends in a direction in which the side frames extend.6. The battery powered vehicle according to claim 1, further comprising:tire housings provided for the vehicle;wherein each of the ends of the troughs extends to the tire housings.7. The battery powered vehicle according to claim 6, wherein each of the ends of the troughs opens to the respective tire housing.8. A battery-powered vehicle having a pair of side frames interconnected by a cross plate, instruments accommodated between the side frames, and a battery installed above the side frames, the vehicle comprising:a dam provided on each of the side frames; anda cover plate arranged to overpass the dams, the cover plate supporting the battery, wherein the dams are square bars.9. The battery-powered vehicle according to claim 8 further comprising:a trough arranged at each of the right and left ends of side peripheries along a direction in which the side frames extend.10. The battery-powered vehicle according to claim 9 further comprising:tire housings provided for the vehicle;wherein each of the ends of the troughs extends to the respective tire housing.11. The battery-powered vehicle according to claim 10, wherein each of the ends of the troughs opens to the respective tire housing.12. A battery-powered vehicle comprising:a pair of side frames;a cross plate interconnecting the side frames;a dam provided on each of the side frames;a cover plate provided on each of the side frames;a battery installed on the cover plate or above the cover plate, wherein the cover plate includes guide portions extending upward, whereby fluid is guided toward the right and left sides of the vehicle at the front and rear ends of the cover plate.13. The battery-powered vehicle according to claim 12, wherein the fluid is battery fluid.14. A battery-powered vehicle comprising:a pair of side frames;a cross plate interconnecting the side frames;a dam provided on each of the side frames;a cover plate arranged to overpass the dams;a battery installed on the cover plate or above the cover plate, wherein the dams are square bars.15. The battery-powered vehicle according to claim 14, wherein the dams extend in a direction in which the side frames extend.16. The battery-powered vehicle according to claim 14, wherein the battery includes a casing that forms a drain port at its bottom.17. The battery-powered vehicle according to claim 14, wherein the cover plate includes guide portions extending downward, whereby fluid is guided onto the side frames at the right and left ends of the cover plate.18. The battery-powered vehicle according claim 17, wherein the fluid is battery fluid.19. The battery-powered vehicle according to claim 14, wherein the dams are unified with the side frames.