Like its predecessors, the Tab S2 does very well in our video playback battery test. Clearly this sort of problem would have shown up during testing, and the Tab S2's platform power is obviously higher than the internal battery can support for an acceptable length of time. The results of this test make me question some of the design decisions made during the creation of the Tab S2. It's almost a given that this result is due to the power required by the display, as the high level of white on a common web page will increase AMOLED power consumption dramatically. At 6.07 hours, it's our second lowest result, beating only the Dell Vewhich I noted for having exceptionally poor web browsing battery life. Our web browsing battery life test is mostly display bound, and the Tab S2 does not fare well during it. However, there's really no way to gauge battery life just by looking at a device's battery capacity, and so we turn to our standard suite of battery tests which includes a WiFi web browsing rundown, a video playback test, BaseMark OS II's battery test, PCMark's battery test, and GFXBench 3's battery test. What's also concerning is that the original Tab S tablets had some battery life issues of their own. The original Tab S tablets were already very thin, and with both Tab S2 tablets again being the thinnest in their class Samsung has had to reduce the battery capacity of each model. When the Tab S2 was originally announced I saw concerns regarding the battery capacity of both models. While this can be offset by reductions in overall platform power, if it isn't offset the tablet can struggle to last throughout the day even when performing relatively lightweight tasks. However, as manufacturers have tried to slim down their tablets and reduce their mass, they have had to decrease the sizes of the batteries they include. Even the original iPad was rated for ten hours of usage, and most tablets from various vendors tend to hit or exceed this target in workloads like web browsing and watching video. Also, turn off while charging to allow the voltage monitoring circuit to measure battery capacity correctly.Modern tablets typically haven't struggled to last users through the day. Do not let power go less than 20% until the OS is fixed. The tablet will slowly charge until it gets enough where it will fully charge on its own. unplug from tablet and plug back in, wait 15 min and try again. If you experience a fault like battery shows then blank screen then battery shows. If there are not indications of an intermittant connection (connect/disconnect sound) then the tablet should show a battery. Then gently wiggle the connector at the tablet port. For those who are having problems try ensuring that the tablet is off and plug it in to a charger capabable of 1A. I'm now connecting an ammeter in series to see exactly what teh tablet is doing. It seems that the OS is not working properly. I wired a USB extension cable (8") to a 5v power supply capable of 35A and I still get the red X. 5A and Samsung chargers capable of 1A cause the red X to appear. However, my galaxy2 10.1 will charge properly on a 'cables to go' charger that can only deliver. Some people claim that if the charger is not genuine samgung then the tablet detects this and limits charging below the required causing the red x on the battery icon. Save yourself a massive headache - check you are using a two amp charger or that your charger is working properly. Hunted around for the original 2amp plug and YAY! Immediately got the green battery charging icon, was able to switch the unit on easily and it is charging away now with a white lightning icon. I looked at the small print on the plug and it's a one amp (1A, 1amp, 1Amp) plug. I was using the plug from my S3 phone with the tab lead. The Tab and Note use a TWO AMP (2A, 2amp, 2Amp) charger. I even bought a new battery as I thought the battery must be duff. If the battery drained right down it was almost impossible to bring the tab back to life. Tried pressing the on/off and volume buttons together which did seem to fix it - but as soon as the tab was unplugged and plugged back in the red x came again. I have been having all sorts of problems with my Galaxy Tab 10.1 not charging properly and having the red x on the battery icon.
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