Heartway Medical Products PF2 User Manual page 20

According to the battery type and condition of the batteries, they usually can be
fully charged in 4-10 hours. This will be indicated when the status light in the
battery charger side panel turns green. Charging the battery longer than ecessary
will not harm the battery. We recommend that you charge the batteries for 8 to 10
hours after daily use. Do not charge the batteries for more than 24 hours.
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