One of our Dell Venue 11's is experiencing weird issues with the battery.
This system is equipped with a 32Wh battery (Dell p/n 9MGCD).
Windows reports the battery capacity to be 32mWh. It had some battery life issues since day 1, but as the system kind of functioned and was needed these were ignored.
A couple of weeks ago, the system stopped functioning completely on battery. It still worked fine on AC and through the Dell Mobile keyboard (that has it's own battery) though. Windows still showed the internal battery as present and 100% charged. Dell's own diagnostic tool (Dell Command power) showed the battery to be in top-notch condititon and fully charged. The bios showed correct voltage levels for the battery.
However, upon disconnecting the battery the tablet immediately turns off.
We did some investigation of our own prior to calling Dell. Windows powercfg shows the following battery statistics:
|SYSTEM PRODUCT NAME||Dell Inc. Venue 11 Pro 5130|
|DESIGN CAPACITY||30 mWh|
|FULL CHARGE CAPACITY||27 mWh|
|PERIOD||FULL CHARGE CAPACITY||DESIGN CAPACITY|
|2015-01-19 - 2015-01-26||35 mWh||36 mWh|
|2015-01-26 - 2015-02-02||33 mWh||34 mWh|
|2015-02-02 - 2015-02-09||36 mWh||38 mWh|
|2015-02-09 - 2015-02-19||38 mWh||41 mWh|
|2015-02-19 - 2015-02-23||31 mWh||34 mWh|
|2015-02-23 - 2015-03-02||27 mWh||30 mWh|
|2015-03-02 - 2015-03-09||29 mWh||32 mWh|
|2015-03-09 - 2015-03-16||27 mWh||30 mWh|
|2015-03-16 - 2015-03-23||27 mWh||30 mWh|
|2015-03-23 - 2015-03-30||27 mWh||30 mWh|
|2015-03-30 - 2015-04-06||28 mWh||30 mWh|
|2015-04-06 - 2015-04-13||28 mWh||30 mWh|
|2015-04-13 - 2015-04-20||27 mWh||30 mWh|
|2015-04-20 - 2015-04-27||27 mWh||30 mWh|
|2015-04-27 - 2015-05-04||27 mWh||30 mWh|
|2015-05-05||27 mWh||30 mWh|
|2015-05-06||27 mWh||30 mWh|
|2015-05-07||27 mWh||30 mWh|
|2015-05-08||27 mWh||30 mWh|
|2015-05-09||27 mWh||30 mWh|
|2015-05-10||27 mWh||30 mWh|
|2015-05-11||27 mWh||30 mWh|
|2015-05-12||32 mWh||36 mWh
As you can see the desing capacity fluctuates and all capacities are in mWh, not in Wh. So about a 1000 times less then expected. On another Venue 11 and a venue 8, none of this happens. It is stable and displays correct values.
One would think that Dell would quickly solve this under warranty. System has CAR warranty until Januari 2016. However, after having picked up the system, they now claim that this is not under warranty. They can't tell why. They might exclude normal battery wear , but based on the output from powercfg /batteryreport it seems clear to me that this was present since the day the system was delivered.
Has anyone experienced similar issues with a Venue 11?
Well, it seems Dell changed their mind. They called back and now state that they will fix under warranty.
Anyway, it might be a good idea to do a "powercfg /batterystatus" if you own a Venue 11 and see whether the correct values are reported. If not, you might eventually run into the same problem.