I have some useful input actually,
The blackberry playbook charger is slightly higher voltage and will charge your device faster than most chargers. Used them for over a year now on phones like SIII with no problems.
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Nooooooo!
Lol, there is a lot of info you will find useful here.
http://batteryuniversity.com/learn/article/all_about_chargers
Keep in mind these are lithium based batteries.
Think of electricity like plumbing. Volts is water pressure, amps is flow rate/current and ohms aren't important in this case but its resistance to flow.
Amps is what determines how fast the battery will charge not the volts. Volts is the amount it will be charged too, this is the most important part to look at when buying a charger. Most are 5 volts. Here comes my terrible analogy. Lol. Imagine you have a plastic two plastic bottles one is 5.2 gallons (volts) and the other is 5 gallons (volts), you are forcing 5.2 gallons into a 5 gallon container. While this won't kill a battery its certainly not good for it.
Amps on the other hand isn't as big of a deal. The device will only take power as fast as it can. Sometimes you'll notice some excessive heat in smaller devices which isn't great for a battery either but better then over charging it.
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For our tablets any universal charger should do the trick. 5volt @1.5-2.5 amp. 2.5 might charge faster if the device allows it but someone mentioned above it won't take more then a little over an amp.
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