Take Amazon’s portable battery charger RAVPower 26800mAh for $34.99. To get that price, all you need to do is click the link that automatically offsets the price by 30 percent. The battery charger sells for about $50 without this promo. While it has dropped to $35 before, it was more than two years ago that the last time that happened directly. Promotions like this are rare and difficult to spot, so as long as you can, you will want to take advantage of it. With this promotion, only the black version is on sale, and the deal expires on Sept. 7.

We are familiar with RAVPower. This is a brand that has been making power banks like this for years, covering multiple generations of smartphones since it became something for the smartphone and the tiny battery. With a battery charger like this, you definitely no longer have to worry about those small batteries. The capacity of 26800mAh is about as large as it gets while still affordable, and that is enough juice to recharge your smartphone half a dozen times before the device itself needs to be recharged. Charge tablets, as well as other mobile devices.

Actually, the power bank can charge three devices at the same time. It has three USB ports providing a total output of 5.5A, and iSmart technology can pick up on which device is plugged in to deliver the best charge possible. If you have a 2.4A charger, which is also made by RAVPower, you can charge the power bank in 14 to 15 hours. It comes with two micro-USB cables for charging, and you can also charge the device pass-through by powering up your phone at the same time. The power bank comes with a portable carrying pocket along with an 18-month support guarantee.

More than 5,000 reviews have been racked up by the charger and users are giving it 4.5 out of 5 stars.

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