SOURCE: How do i change the battery on a ipad generation 3
You have to remove the digitizer with a heat gun then remove the LCD disconnect all ribbon cables from mainboard remove mainboard to disconnect the three batteries. 
SOURCE: how to set up password on my new ipad mini
The following can be done on ipad with iOS 8:
1. Press the home button( the round button on the front side of your ipad), to go to the home screen.
2. Find the Settings icon ( looks like gray clockwork gears) and tap on it to launch the Settings app.
3. After settings app is started try to find on the left side of the screen Passcode ( has a red lock icon near the text) and tap on it
4. In the passcode setting screen you can choose the type of passcode with the Simple passcode setting switched on or off ( simple means a 4 digit number, not simple means any character combination
5. By taping on Turn passcode on you can enter your passcode. Be carefull not to forget your passcode, otherwise you will not be able to use your ipad later.
The battery in it has most likely expired and may cost more than a new iPad to replace. A voltmeter across the charger or a friends iPad may be useful to test your charger works ok.
Intro Date:
March 2, 2011*
Disc Date:
March 18, 2014**
Order No:
MC769LL/A*
Model No:
A1395 (EMC 2415)
Subfamily:
iPad 2
Model ID:
iPad2,1
Std RAM:
512 MB*
Std VRAM:
None
Std Storage:
16, 32, 64 GB
Std Optical:
None
Complete iPad 2 (Wi-Fi Only) Specs
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