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Just like the OPPO R5, the battery life lets down the Desire 820 quite significantly. Despite having a lower resolution display and a larger battery capacity – 2600 mAh – than the R5, the battery life on the Desire 820 is still very poor.
With our usual test settings – regular, daily usage with sync and WiFi/mobile data always on – the Desire 820 just about struggled into the early afternoon before needing a recharge.
The battery drop when the phone was not actually in use was particularly bad – after 30 minutes of just sitting in a pocket, the battery had dropped 6%.
It becomes very hard to justify the 820 when its battery is so bad. It does not even have the benefit of fast-charging technology, which was the OPPO R5's saving grace. You will have to plug the 820 in for over a hour just to get you back to 50% battery capacity.
