Update 10/12/15: New code below.

Each month this summer, the KMASHI 10,000mAh battery has become available for under $10 bucks. In June it hit $9.50. In July, it was $9.40. Now we're seeing it available for $9.29. All you have to do is head to the Amazon page and enter the coupon code ME6ADK4L MHLSNM2R YTI7MT89 at checkout to drop the price down from its usual $14.

Yes, we all see what KMASHI is doing here, but we don't care. This is about saving money. This battery comes with two USB ports (5V / 2.1A and 5V / 1A) that can revive your dying smartphone when you're away from a charger. And thanks to its relatively slim profile, it shouldn't take up too much space in your bag while doing it. You can power the pack itself back by plugging in a microUSB cable, and four LED lights will let you know the remaining charge.

Hopefully you like how black and red look together, because you have just one color to choose from. If you're not quite sure, well, unlike some other deals, something tells us you will probably have another chance to get one for under $10 in a month or so.