Zvoltz Direct via Amazon offers its iPhone 6 Plus 4000mAh Apple-certified MFi Battery Case in black for $44.98. Applying coupon code Y68WAJ6K drops the final price down to $29.98 with free shipping for Prime members, otherwise you'll need to spend $35+ to side-step delivery charges. That's $70 off the original listing, $15 better than the street price and one of the lowest prices that we've seen on any iPhone 6 Plus battery cases.

This battery case offers protection against "daily wear and tear", it has 4000mAh of battery power to charge your device to 100% of its capacity. Built-in LED indicators report battery life at the press of a button. Zvoltz's iPhone 6 Plus case has passed Apple's MFi certification program, so you know it'll be safe with your device. A one-year warranty is included as well for added piece of mind. Rated 3.9/5 stars.

The 3100mAh iPhone 6 model in black is also available at a discounted price: use coupon code K7YUNVSC to drop the final price to $24.99 with free shipping for Prime members. Today's deal is $75 off the original price, $10 better than the average offering and in-line with other deals we've posted on similar battery cases. It's 3100mAh battery capacity will charge you iPhone 6 to 100% of its capacity.

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