Sony CLIE PEG-S320 Operating Instructions Manual page 206

Precautions
• 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.
Chapter6
Additional information
206