Invacare IRC 1720 - Manual (Page 26)

SECTION 3—BATTERIES
Stratos™Portable 26 Part No 1130202
Completion of the charge cycle is indicated by a green battery
light. Full charge will provide approximately 35 minutes of
operation.
NOTE: In order to ensure maximum performance of the battery,
keep the battery plugged in and charging when it is not in use. This
will not overcharge or damage the battery.
NOTE: The battery must be plugged into a power source for the
battery to charge. The battery will not charge when it is attached to
the compressor nebulizer system.
NOTE: NEVER leave the battery connected to either power cable
when the cable is disconnected from the power source. This will
cause the battery to discharge.