Only 3.8mm World's thinnest and lightest Charger-INNOANTS IPhone 6 6s Battery Case,Ultra Slim Extended Battery Case, Portable Charger with Polymer Battery 2400mAh Capacity for Fast Recharge -White

Pros: thru charging with my existing iPhone cable. No need for a second plug. Also, I was advised to use the "extra" case battery first and then use the iPhone battery, as opposed to recharging the phone from the battery. HUGE difference. Unbelievable. Love it.But -It's only the second day, but I feel like the case is negatively impacting the antenna signal. My reception is suddenly horrible (less than 3G to none at all) in areas that were never a problem. If that holds true, I'll be returning it.

While I really wanted to like this case, I it is one of the thinnest, it has lightning bolt connection, It doest look stupid, IT HAS SIGNAL INTERFERENCE! I noticed when In my office when I am constantly on calls I suddenly had NO SERVICE! upon removing the case I had 3 dots. Tested this in a few other areas and same exact thing. Even interferes with wifi. Do not buy this case unless you are intentionally trying to block signals from reaching your phone.

I am changing this review, as I had assumed it would charge the phone for a charge and a half, based on the battery size. I hadn't actually reads the specs, which in fairness to the product, I should have read before posting a negative review.So it gave me a 60% charge, which isn't bad, considering its size, it's a nice overall design. That's after being fully charged overnight.

The design of the case actually caused my phone's internal battery to drain within a few hours. The reason it drained the battery is the case interred with the antenna and I constantly was losing service. The design intent was very good the actual product was terrible. I feel I wasted my money.

Signal interference and slight GPS interference.Camera FLASH badly affected by case (white case) flash shine bounces off case ridge. Otherwise a nice thin case.

This product has the latest technology which makes the battery almost invisible to the user. It is also light weighted that you don't really feel(know) there is a battery charger built-in to the iPhone case. The whole product is awesome!

PRO:size (thin) and colorCONS:it switches while charging between charging the phone and the case.. I dont like this as I would like to charge allt he phone first and then the case for backup purposes. Also, it will 'vibrate' at night when it 'switches'.. like when you first connect the phone to the wall.. this is annoying while sleeping as this 'swapping' charge happens..Once you start the use of the backup, you cant stop it.. you have to use all the backup power stored.