Rapid battery loss on devices connected to Wi-Fi. Who faced?

Question

WiFi

One apartment has:

• iPhone 3GS
• iPhone 4
• ZTE Blade

The Internet is distributed to them via WiFi using the Asus WL-500gpV2.
Recently, a strange situation has arisen. If Wi-Fi is enabled on the phones, the charge is lost ~ 20% in half an hour. If WiFi is turned off, they discharge normally. There are 2 laptops on the same network. They don't see that.
The router tried to change, change security settings, install non-native firmware. Still the same. This is not seen at work. There the Internet is distributed through Dlink Dir-300.

You don't want to give up a great router. Tell me where to dig to defeat this problem?
Thank you!

Answer 1

Set a fixed channel for Wi-Fi distribution. In the settings there is a choice (there are 13 of them or so). There are also settings: RTS / CTS Threshold (put 4096), another Fragmentation Threshold (4096).
Link: http://goo.gl/PBVxx

Answer 2

You can listen to the broadcast on the subject - which channels are busy. As far as I remember, out of 12-13 WiFi channels, 4 work without collisions. Next, choose another freer channel.

Answer 3

I experienced fast discharge even on iPhone4. The problem turns out to be in incorrectly written programs that use push notifications. As an example - iDaPrikol, MobileRSS (not sure).
On 3G, at one time, the complete shutdown of Push with a reboot of the phone helped. on 4G it is enough to unload the program from the background.

Answer 4

Did you somehow manage to overcome this problem?