HP Compaq d220 MT Hardware Reference Manual page 22

Battery Replacement
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Batteries, battery packs, and accumulators should not be disposed of
together with the general household waste. In order to forward them to
recycling or proper disposal, please use the public collection system or
return them to HP/Compaq, their authorized partners, or their agents.
CAUTION: Static electricity can damage the electronic components of
the computer or optional equipment. Before beginning these procedures,
ensure that you are discharged of static electricity by briefly touching a
grounded metal object.
1. Prepare the computer for disassembly.
2. Remove the right access panel.
It may be necessary to remove an expansion card to gain access to the
battery.
3. Locate the battery and battery holder on the system board.
4. Depending on the type of battery holder on your system board,
complete the following instructions to replace the battery:
5. To release the battery from its holder, squeeze the metal clamp
that extends above one edge of the battery.
Hardware Reference Guide