Toshiba SATELLITE M300 - Manual (Page 115)

115 Mobile Computing
Changing the main battery
6 Slide the battery release latch to release the battery.
7 Pull the discharged battery out of the computer.
(Sample Illustration) Removing the battery
If the battery is leaking or its case is cracked, put on protective
gloves to handle it, and discard it immediately. Always dispose of
used battery packs in compliance with all applicable laws and
regulations. Put insulating tape, such as cellophane tape, on the
electrode during transportation to avoid a possible short circuit, fire
or electric shock. Failure to do so could possibly result in serious
injury.
Inserting a charged battery
To insert a battery:
1 Wipe the terminals of the charged battery with a clean cloth to
ensure a good connection.
2 Insert the charged battery into the slot until the latch clicks.
The battery pack has been designed so that you cannot install it
with reverse polarity.