Yealink W52P - Manual (Page 17)

Getting Started
5
3. Close the battery cover.
Note
Battery Information
Technology: Nickel Metal Hydride (NiMH)
Size: AAA
Voltage: 1.2V
Capacity: 800mAh
We strongly recommend you use the batteries complying with the above parameters.
Because the compliant ones can guarantee the specified operating time, full
functionality and long service life. The operating time of your handset depends on the
capacity and age of the batteries and the way they are used.
We recommend you use only the batteries that came with the handset or replacement
batteries approved by Yealink technology:

Sanyo NiMH 800

GP 850 mAh

Yuasa Technologies AAA 800
Battery Capacity
The capacity of the batteries depends on the use of backlight and talk time.
Charging time: approximately 6 hours (fully discharged to full capacity).
Standby time: up to 100 hours when the backlight is disabled.
Talk time: up to 10 hours active talk time (with full charged batteries).
Do not short-circuit the batteries, as short-circuiting the terminals may damage the
batteries or the handset.
Do not use a damaged battery, this may cause an explosion.