People have been complaining that it takes too long to charge the large battery in the Chuwi Hi12.|
The Chuwi Hi12 actually does support fast charging over USB, but it takes the right combination of charger and cable to actually get fast charging to work.
Here are a few tips to make sure you are charging at the highest rate possibe:
You must have a fast charger. The tiny square ones from the dollar store will not work! Also, charging from a PC or other USB port is not likely to give you a good charge rate.
The included Chuwi Charger actually will supply well over 2A, but only under the conditions below. Note also that USB-c is becomming more common. This is both good and bad. USB-c supports higher voltage charging, which the Hi12 does not, so a USB-c adapter may produce more voltage (and thus current), but only when used with a USB-c device. If it is rated at 3A (or more), but comes with a USB-c cable, it may or may not be capable of sourcing >2A at the normal 5V.
You need a *normal* USB adapter that is rated at at least 3A, and says it supports *normal* USB fast charging.
The cable is the most important part. The Chuwi Hi12 requires a special high charge rate USB cable. Again, those skinny brightly colored ones in the bins at the local discount store will not help you.
The included cable is pretty good, and much better than the average USB cable. It can consistently charge at 2A, but you can do even better:
If you want to buy another/additional USB cables, look for the following:
-- The package/advertising shows a specific current rating -- just saying "fast data transfer and charging" (note that terminology is ambiguous) is not good enough. Look for 2.1A or more. The cable will be obviously thicker than regular cables.
-- The package/advertising shows a specific wire guage (ga or awg). Look for 18 awg.
-- Look for dedicated Charge-Only USB cables (will usually specify wire size as above).
Here is one on eBay found from a quick search. I do not know anything about this seller:
http://www.ebay.com/itm/2A-3A-5V ... ctor-/171699709183?
-- Fast charge cables will usually be short. 1m (3 ft) at most.
-- Shorter is better. I was able to get over 2.25A with the Chuwi included charger and a short, high quality and obviously thicker cable even though I got the cable at a local flea market, and it had no packaging/specifications.
-- Make your own Charge-only cable. Get USB connectors from an old cable, or from a parts vendor, and obtain some 18 awg or even thicker wire. The results may not be pretty, but if made correctly, it will work. Be careful of polarity! A charge only cable also has security benefits.
3. USB tester or "USB Doctor"
Buy a USB Tester (often called a "USB Doctor") and carry it with you when you travel with your Chuwi Tablet.
Here is a basic example:
http://www.dx.com/p/usb-charger- ... -blue-silver-305545
-- Avoid ones that have a skinny wire of thier own. You can loose or degrade the high-current capability right there.
Either look for one where all connectors are "hard soldered" to the device, the included cable is thicker, or replace the cable yourself.
-- Other features are nice -- such as OLED displays -- Watt/Amp-hour calculations, etc. But you really only need a basic one.
Note also that there are chargers with built-in voltage/current monitoring. I have several of these, and really like them:
www.dx.com/p/5v-6a-output-3-5a-6 ... dapter-white-431312
These say they are rated at 3.5A for a single port, but I have never seen it charge my Chuwi at more than 2A. I think it will go over 2A with a good charge only cable, but I have not tried this combination yet.
The nice thing is that it will happily charge my Chuwi Hi12, and several phones at the same time, and I know exactly how fast each one is charging.