Sony DCR-SR220 - Manual (Page 104)

10
WARNING
Battery may explode if mistreated. Do
not recharge, disassemble or dispose of
in fire.
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When the lithium battery becomes weak, the
operating distance of the Remote Commander
may shorten, or the Remote Commander may
not function properly. In this case, replace the
battery with a Sony CR2025 lithium battery.
Use of another battery may present a risk of fire
or explosion.