iPad 3 would not boot

[Akira Shimazu]

I have an old iPad 3 from 2012 that i want to turn on and backup the data. i am aware of the condition of my ipad with zero battery charge so i had to charge it for least an hour.
 here's what happened:

 

Phase 1
1. Black screen
2. Stuck in Booot (apple logo)

 then i disconnect the ipad from wall charger and plug the usb to my macbook air. for some reason it does boot normally

like this:

 

Phase 2

1. blackscreen
2. Red battery symbol
3. Apple logo
4. Lock screen with Glitches showing the (2)nd images. 
5. everything si fine and battery shows up 3 percent charging.

then it went blank again. and i stuck with blackscreen > red battery logo> apple boot >black screen and so on.

any tips or if smoeone had similar problem...

[WhitetailAni]

Get an A1070 (wall jack to FireWire power brick), and a FireWire to 30-pin cable. That usually fixes completely flat battery issues.

Leave it charging for a day undisturbed.

[Akira Shimazu]

20 hours ago, FakeKGB said:

Get an A1070 (wall jack to FireWire power brick), and a FireWire to 30-pin cable. That usually fixes completely flat battery issues.

Leave it charging for a day undisturbed.

i try thank you. si it's the battery fault right? the system only boots when there's enough charge yet flat battery does not pass the minimum power for booting?

[WhitetailAni]

2 hours ago, Wolfycapt said:

i try thank you. si it's the battery fault right? the system only boots when there's enough charge yet flat battery does not pass the minimum power for booting?

The battery has become too discharged for iOS to allow the system to boot, and USB chargers can't give it the juice it needs to kickstart it. FireWire chargers can though