Precor EFX 821 - Manual (Page 36)

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Assembling and Maintaining the EFX 821 Elliptical Fitness Crosstrainer
Replacing the Battery
The equipment’s battery is built to last for a long time.
However, if you feel that the battery may need replacing,
check with an authorized service technician. Refer to
Obtaining Service.
CAUTION: The battery stored inside the equipment contains
hazardous materials and must be disposed of according to
Hazardous Waste Regulations. Refer to Hazardous Materials and
Proper Disposal.