Battery acquired.
「乾電池」を入手しました。
101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin

Battery is item 89 of the game's item table, in the Items group. The script names it on disc 2.
Lines of the script that name it, each with a link to its place in the script.
Battery acquired.
「乾電池」を入手しました。
Item table: Hand Crank Battery Men's Extract
English translations by Cargodin for Hilltop Works Fan Translation Patch: https://www.patreon.com/hilltopworks/posts/kowloons-gate-160555525?collection=18503