Abstract: An indication device of a battery includes a compression member and a plurality of light sources. The plurality of light sources are arranged in a ring shape to surround the compression member and configured to indicate power of the battery.

Abstract: A battery assembly includes a battery body, a housing, a switch assembly, an output terminal, and a snap clip assembly. The housing includes an accommodation chamber. The battery body is mounted in the accommodation chamber. The switch assembly is fixed at the housing and configured to generate an in-position signal. The output terminal is arranged at the housing and configured to output power of the battery body and the in-position signal. The snap clip assembly is arranged at the housing and configured to cause the switch assembly to be in a first status when no external force is applied to the snap clip assembly, the in-position signal being at a first level in the first status, and when an external force is applied to the snap clip assembly, cause the switch assembly to be in a second status, the in-position signal being at a second level in the second status.