Sony MDR-HW700DS - Manual (Page 22)

2.
When the charge indicator goes off, disconnect the micro-USB cable.
Notes
Charge the battery in an ambient temperature of between 5 °C and 35 °C (between
41 °F and 95 °F). If you charge it outside the recommended temperature range, the
charge indicator flashes and the battery may not be charged.
When the rechargeable battery of the headphones has been consumed, a warning beep
(about 2 seconds) sounds and the headphones are turned off.
You can charge the headphones while using them. The charging time will be longer than
those listed below.
Estimated charging time and battery life
Charging time Battery life 1)
About 3 hours 2) About 12 hours 3)
About 30 minutes 4) About 2 hours 3)
1) At 1 kHz, 1 mW + 1 mW output
2) Time required to fully charge an empty battery
3) Time may vary, depending on the temperature or conditions of use.
4) Time spent to charge an empty battery
Checking the remaining battery power of the headphones
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