Smartphones with longer battery life may be difficult to find these days, especially with the device hardware and software in constant upgrade and use. To serve as a guide for consumers, outlined below are some of the best smartphones with longest battery life.

If your main concern is battery life, then Oukitel K10000 and the upcoming K10000 Pro are perfect for your need. Not only these phones are Android-based devices, but they are also packed with a massive battery of 10,000 mAH.

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Based on recent tests and consumer feedbacks, the battery of the said variants would last more than a week, with just one full charging being done. As of the current writing, the device is known to be priced below around $200.

If you would like to try a trusted brand in the market, you might want to check the Lenovo P2 smartphone. Unlike Oukitel's K10000 series, this device also boasts of a powerful hardware, apart from its battery life.

The Lenovo P2 is powered by the Qualcomm Snapdragon 625 SoC clocked at 2.0 GHz. It has an Adreno 506 GPU for graphic support, and is powered by a 5100 mAh non-removable Li-Ion battery, and weighs 177 grams, according to Candy Tech.

Another trusted brand in the market would be the ZTE A2 Plus. This device comes with a 5000 mAh, which could last for one to two days. However, it might even surpass the said days if you will be using a battery saving app.

Other highlights of the device would include its 5.5 Inch Full HD Display. Inside would be a processor clocked at 1.5GHz, coupled with 32 GB of internal storage and 4 GB of RAM.

If you seek a balance between powerful performance and battery life, then the Huawei Mate 9 is something you should try. It is powered by a powerful processor, the Kirin 960 octa-core processor, with a battery capacity of 4,000mAh.

Being a trusted brand in the market, Huawei's Mate 9 is a combination of aesthetics and power. With its known battery, it is expected that you may enjoy using the device for almost a day.

Watch here below a smartphone that could last a more than a week: