Sony PEG-S320 - Manual (Page 206)

206 Chapter6 Additional information
• You do not have to replace batteries. When the remaining battery
indicator reads zero, connect your CLIE handheld to the AC adapter and
start charging immediately. Never disassemble your CLIE handheld to
take out the battery.
When the remaining battery indicator reads 0.
If your battery drains and you leave your CLIE handheld in an uncharged
state for an extended period of time, all of the stored data will be erased.
Sony suggests you charge your CLIE handheld frequently.
Precautions