The Lithium-Ion battery (not used in Satellite notebooks before 1997) offered a standard productivity up to two hours.
A built-in Lithium-Ion battery provides up to 20 hours of playback time.
It uses proprietary Lithium-Ion batteries.
Another problem is that Lithium-Ion batteries require a regulator circuit to regulate battery charge preventing damage, and so replacement batteries either require a built-in one or a grafted regulator circuit added.
Designed with a built-in Lithium-Ion battery, built-in speaker...
Well, some of the new Lithium-Ion batteries have a pretty long life, or you might want to run it off solar; the new ones run on what comes through on a cloudy day.
It uses proprietary Lithium-Ion batteries and MMC/SD card storage.
Batteries 2 modules of Lithium-Ion batteries with 5100 Wh/ 180 Ah total capacity; to cover eclipses during the nominal lifetime of the orbiter (until end 2022).
Modern game systems such as the Nintendo DS and PlayStation Portable have rechargeable Lithium-Ion batteries with proprietary shapes.