The Stone 3 is one of a range of back up batteries available from Powerocks. It is a small, lightweight, portable battery capable of recharging two devices at a time and is compatible with both Apple and Android devices. It measures approximately 3″ x 3″ x 1″ and weighs approximately 250gm (about 1/2lb). It comes with a charging cable to allow it to charge from a USB port, and with a drawstring carrying bag that has a separate section for cables.

The Stone 3 has 2 output ports – allowing it to charge 2 smart phones or a smart phone and a tablet, at one time. It has a 2A output suitable for an iPad, and a 1A suitable for charging an iPhone or other smart phone. You need to supply your own cable to charge your iPad, iPhone, Android device, camera, bluetooth headset, GPS etc but it will charge pretty much anything that charges via a USB and requires 1-2A. It is powered by a Lithium Ion battery with a capacity of 7800mAh which is enough juice to fully charge most smartphones 5-6 times or you can use the dual USB outputs to charge a phone and tablet simultaneously. During my testing  it would charge an iPad approximately 80%.

It has 2 input channels – a Micro-USB and a Mini USB, you can use either, or both, to charge it. The charging cable that comes with it can be used to connect the Micro-USB to the USB port of a computer or to the charger of your iPhone, iPad or other device (not included). If it is charged via a 2A charger (such as those that come with an iPad) it takes approximately 4-5 hours to fully charge, with a 1A charger it takes approximately 8 hours. It can be charged via a computer USB , but it takes longer so I don’t really recommend doing so.

When it is fully charged the “Powerocks” on the top lights up, each letter represents 1/9 (11%) of the total power, so as the battery charge decreases you can tell how much power is left by looking at how many letters light up.




I tested this out extensively on a recent family vacation and it worked very well. The  carrying case was a great way to carry the extra cables I needed and always have them handy. We had many occasions where we were out for the day and an iPad, iPad mini, iPod Touch or phone ran low on battery, and we just plugged them into the Stone 3 and kept on using them. It also saved the day several times when we forgot to recharge our digital camera overnight and found it had a dead battery when we were out for the day. I just popped the Stone 3 in my coat pocket, connected it up to the camera and could go on shooting pictures whilst it re-charged.

What we love about the Stone 3 : lightweight and portable enough to slip in a purse or bag, compatible with a range of devices, can charge iPad and iPhone at the same time, capable of charging an iPad to 80% charge, comes with carrying bag. A great solution for charging on the go.

recommended  by the imums


The Stone 3 is available online from , Amazon or other retailers.



Technical Data:
BATTERY : 7800mAh, Lithium ion
INPUT: 5.0 V / 2.0 A
OUTPUT: 5.0 V / 2.0 A
SIZE: Height: 2.95” Width: 2.95” Depth: 1.06”
INCLUDES: USB to Micro USB charging cable
Water resistant cotton carrying case

MSRP: $99.99



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