https://www.ifixit.com/en-eu/products/logitech-signature-slim-solar-plus-533-000248-keyboard-battery-genuine
Logitech Signature Slim Solar+ 533-000248 Keyboard Battery - Genuine
Replace a dead or dying battery in your Logitech keyboard.
logitech signature slimkeyboard batterysolar533000248
https://jcp.org/aboutJava/communityprocess/mrel/jsr248/index.html
JSR-000248 Mobile Service Architecture - Maintenance Release
mobile service architecturejsr000248maintenancerelease
https://www.ifixit.com/de-de/products/logitech-signature-slim-solar-plus-533-000248-keyboard-battery-genuine
Logitech Signature Slim Solar+ 533-000248 Keyboard Battery - Genuine
Replace a dead or dying battery in your Logitech keyboard.
logitech signature slimkeyboard batterysolar533000248