The HP M64305-171 is a lithium-ion replacement battery for compatible HP notebooks. This 3-cell model has an energy capacity of 38Wh, for replacing the battery in supported notebook configurations.
It is listed for the HP EliteBook 830 G9, EliteBook 840 G9 and EliteBook 845 G9, plus the Elite x360 830 G9 2-in-1 and Elite x360 1040 G9 2-in-1. M64305-2C1 is listed as a functionally equivalent part; WP03038XL and WP03XL are alternative references.