Unitech PA950 - Manual (Page 12)

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Charging The Terminal Battery
Charging the batteries for the first time
Charging the main battery and backup battery for the first time
Before using the PA950 for the first time, charge the unit for 10 hours to
fully charge the empty backup battery.
Caution: Removing main battery with having backup battery fully charged
will cause data to be lost.
Charging the main battery
You can use the power adaptor with USB charging cable or desktop
cradle to charge the main battery. For spare batteries, please choose the
2 slot or 4 slot battery charger.
Note: Do not charge the battery under 0°C (32°F) or above 45°C
(115°F). Allow the battery to warm up to room temperature before
charging.