Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: hello do i need to buy a seperate gadget to charge the device thank you
Document: Great item, Need something with more power than I already had. Thank goodness for the Kindle pop up sales. Great buy.
They are not allowed to charge their phones at work the regular way. Daily some one is asking to use his charger. This was a wonderful buy. I am extra happy. Thank you Amazon.
Comes with everything you need to charge your phones or tablets, including the Kindle Fire HD.I really needed this gadget. It's small enough to fit in my purse, and I can always have a back up power source for my Kindle Fire and my phone which is not even a smartphone, just a Motorola flip phone. Stick it in my purse and go and it charges before I get there.The unit has both a USB slot and a Micro-USB slot.
It did not hold the charge,  even though it was just charged. It did not charge the device fully. Would not buy again
Seems a good, solid backup battery. It works with the Duracell Powermat charging system, although you need to buy a Powermat separately. It's good to have an extra battery for those days when one charge isn't enough. The only trouble is that those days are rare for me, and it seems like when they do come around, I've forgotten to pack the backup battery. So I need to hunt for a way to charge my phone anyway.
On the Duracell Powermat GoPower sent to me, there was only one port and that was a USB port. There was no way to charge up the GoPower so that you would be able to charge your device with it. It probably would have been a good buy if it had been like the one in the picture which has a micro and USB port.
It's a great backup when you need it and you never know. Told all my friends about  it and very few knew you could buy this. Thanks
I purchased this product with the intent to use it when I couldn't plug in my device when I was on a plane or car trip. Since my Kindle and iPhone both have a battery life that last most trips I don't need it often. It works fine within a few weeks of a charge. After that it starts losing the charge quickly.
These batteries come in handy for travel, camping, taking extra video and pictures at school games, and keeping devices for the wife and kids in business when they don't plan ahead and charge their stuff.This is a larger unit than the daytrip, in both size and therefor battery capacity. It doesn't have attached cables like the daytrip version, so you'll have to remember to pack whichever cables you'll need for your device(s).
The Overnighter comes with its own charging cable (USB to micro USB, which means if you've got an Apple device you need your own cable). Using the Overnighter's cable, my G2 will charge in roughly 2.5 hours, which is pretty darn amazing when you think of the size of the battery it has. This puts it just a little behind the charging pace of the "rapid charger" that my phone came with, and a bit ahead of standard wall charging.
Answer: I charge mine on my computer or in my car