Phablets don’t get much prettier than the Galaxy Note 5 and Galaxy S6 egde+, but if you’re willing to sacrifice stunning design for crazy amounts of battery life, ZeroLemon has you covered.

With its new 3,500mAh battery cases, which look a lot like rubber bricks, you can triple the battery life of your device for a weekend of use without charging.

Combined with the 3,000mAh battery that’s inside your Note 5 or S6 edge+, this ZeroLemon case gives you a total of 11,500mAh of juice. That should provide enough power for at least two days of use — even if you’re a heavy user who likes watching videos and playing games.

The ZeroLemon case is made of sturdy TPU, so it also provides impact protection for your beloved device. That’s good, because with a case this big, it’s probably not going to fit in your pocket. Just be careful you don’t damage hardwood floors and tiles if you do let it slip.

If you can live with a case that makes your smartphone almost three times as thick for extra battery life, you can get ZeroLemon’s new cases for Galaxy Note 5 and Galaxy S6 edge+ from Amazon now, priced at $39.99 each.