Hello!
I have a Google Nexus 7 2012 WiFi (grouper) tablet. 16GB version.
I recently formatted it to F2FS file system and installed SlimKat rom 4.4.4.build.9.0-8258
with TWRP 2.8.5.1 It is not rooted yet (postponed it because laziness).
Starting from today for some reason my recently bought 2.1A charger was barely charging my Nexus 7. Before it was working very well. Charging as supposed to,even when watching videos. I had an idea to check the amps coming in from the charger, so I installed Ampere app which measures charging current. To my surprise, Nexus 7 was taking barely 150 miliamps. Sometimes it would jump to 400, even up to 550, then it would drop to 40 and sometimes even to 0 for a few seconds, when in reality it should be charging stable 1500 miliamps.
I decided to check the same cable with the same Ampere app on my Samsung Galaxy S3. To my surprise again, Galaxy was charging with very stable 1000 miliamps just like it is supposed to. I tried several other Samsung cables and they were giving about 500ma to Nexus, although it was constantly jumping somewhere between 400-550. Using the same cables on Galaxy I would get 600 or 700 stable miliamps of charging.
I cannot explain this. All the cables give unstable charge to Nexus, as opposed to stable and higher charge to Galaxy. And especially the cable with 2.1 amps (Travel charger from a Polish brand Forever, without detachable cable - not a cheap one) , meant for tablets is giving the worst and most unstable charge. And it has been charging without problems before, and still is - just not my Nexus.
So I can only assume that the problem is either with charging port on Nexus, or something is wrong with battery? Could it somehow be the new ROM + file system? I find it very unlikely but still can't completely rule out without listening to your opinions.
Thanks in advance,
viuksuns
I have a Google Nexus 7 2012 WiFi (grouper) tablet. 16GB version.
I recently formatted it to F2FS file system and installed SlimKat rom 4.4.4.build.9.0-8258
with TWRP 2.8.5.1 It is not rooted yet (postponed it because laziness).
Starting from today for some reason my recently bought 2.1A charger was barely charging my Nexus 7. Before it was working very well. Charging as supposed to,even when watching videos. I had an idea to check the amps coming in from the charger, so I installed Ampere app which measures charging current. To my surprise, Nexus 7 was taking barely 150 miliamps. Sometimes it would jump to 400, even up to 550, then it would drop to 40 and sometimes even to 0 for a few seconds, when in reality it should be charging stable 1500 miliamps.
I decided to check the same cable with the same Ampere app on my Samsung Galaxy S3. To my surprise again, Galaxy was charging with very stable 1000 miliamps just like it is supposed to. I tried several other Samsung cables and they were giving about 500ma to Nexus, although it was constantly jumping somewhere between 400-550. Using the same cables on Galaxy I would get 600 or 700 stable miliamps of charging.
I cannot explain this. All the cables give unstable charge to Nexus, as opposed to stable and higher charge to Galaxy. And especially the cable with 2.1 amps (Travel charger from a Polish brand Forever, without detachable cable - not a cheap one) , meant for tablets is giving the worst and most unstable charge. And it has been charging without problems before, and still is - just not my Nexus.
So I can only assume that the problem is either with charging port on Nexus, or something is wrong with battery? Could it somehow be the new ROM + file system? I find it very unlikely but still can't completely rule out without listening to your opinions.
Thanks in advance,
viuksuns
xda-developers