If you have an iPhone and you have the Facebook app on your iPhone, you might want to dump the app. Guardian tech writer Samuel Gibbs has found that deleting the Facebook app and using Safari instead can boost battery life by up to 15%:
On average I had 15% more battery left by 10.30pm each day. I had also saved space, because at the point I had deleted the Facebook app it had consumed around 500MB in total combining the 111MB of the app itself and its cache on the iPhone.
To make sure that this wasn’t an isolated incident, I also recruited several other Facebook-using iPhone owners to conduct a similar test. They all found similar results, with increased battery life when using Facebook in Safari having uninstalled the main Facebook iOS app.
That’s got to suck if you’re Facebook, who are investigating this report. But you should be advised that this is not the first time Facebook has run into this issue. Battery usage by the Facebook app ran amok last year even when sleeping, an issue the company later resolved. Clearly, there are still issues with the app and battery drain.