Directions for use Maintenance 91
Battery maintenance
The battery is maintenance free during its normal life.
• No maintenance is necessary during normal operation.
• If the monitor is not used, check and recharge the batteries every three months. The
battery should not be allowed to fully discharge during storage.
• Replace the battery every 2 to 5 years (depending upon application). When the
running time falls substantially under two hours (lithium ion battery), or one hour (lead
acid battery), replace the battery.
Recharging the battery
Totally discharged batteries require the following times to charge:
• Lead acid battery: 80% capacity - 2.8 hours, 100% capacity 3.5 hours
• Li-Ion battery: 80% capacity - 2.5 hours, 100% capacity - 6.5 hours
It is possible to use the monitor when the battery is being charged; however, the charging
time of the battery will be extended.
1. Connect the monitor to the mains but do not switch it on.
2. The LEDs for both mains and battery are illuminated.
3. The battery LED is extinguished when the battery is fully charged.
Battery disposal
Batteries must be disposed of in municipally approved areas or sent back to Welch Allyn.
See “Recycling monitor components” on page 99.
WARNING Explosion warning. The battery must not be burned or disposed of in
domestic trash.
WARNING Flammability and chemical danger. Do not open the battery.
WARNING Protect the contacts from shorting when disposing of the battery.
Apply non-conducting tape to the contacts.
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