Russ, I have few questions what to ask you.
1) For Intocicuit, how long does it take to fully charge the Surface Pro (from 5-10% to 100%)?
2) How many times I can charge the Surface Pro? I know it has 26000mah and Surface Pro's battery is 5676mah.
Does it mean I can charge up my Surface Pro for 4 times with that Intocircuit battery?
3) Will it overheat if I charge and using Surface Pro at the same time?
4) Can I charge it and play games at the same time (can battery continue charge up during the use)?
5) XP18000A and the Intocircuit 26000 Power Castle which one is better(performance, quality, charging time)?
I really appreciate for your answers. As this is a over US$100 battery, I don't want made the wrong decision.
Thank you,
Alan
Alan --
I will try to answer your questions as best I can, but the choice between the two will be largely driven by your intended usage. I bought the battery (later two) for my Ladyfriend to use on her flights from Atlanta to Shanghai. With a brief stopover in Tokyo, that is 18 hours of flying time. I first bought the XP18000A, then later bought the Intocircuit 26000, figuring that I would keep one for my own use. I don't have as much actual data as you would like, but maybe describing her usage will help.
My usage concept is that the battery is a
backup source rather than a
charging source. With the battery connected, the Pro will bypass its battery and draw all power from the external battery, so when the external battery is fully discharged, you still have the Pro with a full battery. That is how she begins the flight, with the battery connected. Her in-flight usage is a mixture: she does some work (Excel, etc.) and then watches movies. She brings back Chinese DVDs, and I load those onto 64G USB drives for her next trip. Her relative usage varies, and I have no idea what it is. She likes the XP18000 because it is smaller, lighter and "prettier" (Oh, ok.), but the 26000 will get her to Shanghai with the ability to work or watch for the whole trip. I bought a spare AC adapter for her to keep at her Shanghai condo, so she does not have to carry the adapter on her outbound trip. She then carries the adapter from her condo on her internal China travels, then leaves it there when she returns. She is a small Lady, so is sensitive to how much stuff she has to carry when flying.
So, to your questions:
1 - I don't know. I never tried it that way, because that was not my usage concept. Mike Lee at Mikegyver.com might be able to tell you. He has done a lot of testing on the Pro and the Intocircuit battery.
2 - Never tried that either, but you can pretty much do the math. It should charge it approx four times.
3 - No it will not overheat. I tried both batteries in a combined usage/charging mode, and there was no indication of overheating.
4 - Yes. The Pro will draw its power from the external battery, and the battery will use the input/output difference to charge itself. Heavy video usage will slow the charge rate, but I don't know how much.
5 - "Better" is like beauty, it's a personal thing. Most of the difference is between 18,000 and 26,000. The XP18000 is smaller and lighter (and, don't forget, prettier), but at a cost of 8000mah. She took the XP18000 on a trip to Dubai, because she didn't have that long, single-leg flight, but she will take the 26000 on her next China trip. Charging times are relative to the respective battery sizes. The Intocircuit adapter is 18.5V, 2 Amp. I think the XP18000 adapter is similar, but don't have it here.
I would do some more tests for you, but both of the batteries are at her house now. (Well, there went that part of the plan.)
I hope this helps. If you have any more questions, I will try to answer as best I can.
Regards,
Russ