| 摘要 |
PROBLEM TO BE SOLVED: To provide a backpack power source including a secondary battery.SOLUTION: A backpack power source 1 includes a case part 5 housing a secondary battery 51, and a backpack part 6 for carrying the case part 5 on the back of a user. The case part 5 has a back-contacting surface 54 that faces the back of the user when carried on the back. The back-contacting surface 54 is provided with a recess 55 and a projection 56 formed thereon, each of which extend in a horizontal direction in the state that the case part 5 is carried on the back. |
