Important Notes About Battery Use; Recharging Batteries (Nimh Battery Pack Only) - Respironics 920M PLUS Operator's Manual

Important Notes about Battery Use

Four AA alkaline batteries provide the 920M PLUS with approximately 100
hours of continuous operation, while the Rechargeable NiMH Battery Pack
provides the 920M PLUS with approximately 45 hours of continuous
operation.
Clock/calendar settings can significantly affect battery storage life.
Batteries drain during storage, but they drain much more quickly when the
unit's clock/calendar functions are set. Refer to "Calendar and Clock
Settings" on page 14 for more information.
With AA Batteries
•
If the clock/calendar is not set when the unit is stored, alkaline batteries will
need replacement in 10-12 months if the unit has not been used.
•
If the clock/calendar is set when the unit is stored, alkaline batteries will
require replacement in about 6 weeks if the unit has not been used.
•
Using the oximeter will shorten the required replacement time.
With Rechargeable NiMH Battery Pack
•
If the clock/calendar is not set when the unit is stored, the Rechargeable
NiMH Battery Pack will need recharging at least every 2 months if the unit
has not been used.
•
If the clock/calendar is set when the unit is stored, the Rechargeable NiMH
Battery Pack will need recharging at least every 3 weeks if the unit has not been
used.
•
Using the oximeter will shorten the required recharging time.

Recharging Batteries (NiMH Battery Pack Only)

•
Completely recharging the NiMH battery pack requires approximately 90
minutes when the unit is completely discharged.
•
The expected useful life of the Rechargeable NiMH battery pack is 500
charge/discharge cycles, or approximately 10 years, whichever is first. The
battery pack must be charged at least once each year to maintain optimal
battery life.
•
AA alkaline batteries cannot be recharged in the charging stand.
Basic Operation 7