Oppo HA-2 - Manual (Page 8)

Charging Status:
The Charging Indicators on the side of the unit may show the
following statuses:
< 25% 25%
-
50%
50%
-
75%
75%
-
100%
Fully
Charged



☼


☼


☼


☼







Legend:
 - dark
☼ - slowly flashing: normal charging; quickly flashing: rapid
charging
 - green light
CAUTION:
Use only the VOOC Rapid Charger and the USB A – USB
micro-B data and rapid charging cable to charge the
unit.
Make sure the environment temperature is between 10°C -
35°C (50°F - 95°F) when charging the unit. If trying to
charge outside of this temperature range, charging
may not occur properly.
If you do not plan to use the unit for a long period of time,
please store it in a cool place avoiding high
temperatures. Charge the unit at least once every 6
months in order to avoid completely draining the
battery.