AASTRA DT292 for MD Evolution User Guide EN - Manual (Page 126)

Installation
MD Evolution – Cordless DT292 126
Charging the battery
Place the phone in the charger as shown in the figure below.
The battery is being charged when the lower green LED on the
charger is on (and the battery meter on the display flashes). If the
battery is completely empty it can take a few minutes before the
lower green LED on the charger is lit.
When the battery is 90% charged, the LED starts flashing (3
second intervals) and when the battery is fully charged, trickle
charging starts (LED lights up for 1 second every 30 seconds) and
the battery is ready.
Notes:
Place the DT292 in the charger and charge it for at least 4
hours before using it the first time.
Make sure the local mains voltage corresponds to the
voltage on the charger.
Only use the charger that is delivered with the phone.
Do not connect the phone to the charger without a battery.