iPad Air A1475 Boot loops after replacing battery

[trepachka]

This iPad was working fine except the battery was not holding charge for more than 40 minutes. I replaced it with a new battery. I haven't glued the battery yet, just inserted it into the slot and held it with battery screw.

The iPad was powered on with the new battery and I am getting white screen with Apple logo for about 10 seconds, then the screen turns dark. It then cycles like this forever.

I know the battery is working because the iPad continues to boot loop without the charger until it depletes to 0% and the message displays I need to plug in the charger.

I tried to do restore thru iTunes. The software finds the iPad, another message on iPad recognizes iTunes and asks to plug in the cable which I did.

I am getting error 4013 while either updating or restoring the OS.

Does anyone have any experience dealing with this issue? I am not strong with Apple products.

One thing that I noticed. The original battery did not want to slide out freely. When it finally did, the ring on the battery where the battery screw goes in to secure the battery to the motherboard was broken off and must have remained where the battery connector is.

In order to install the new battery, I cut the ring off on the new battery to make it slide into the slot. I do not know whether the ring carries any copper vias or it's just there to connect the battery to the motherboard.

Thank you for your assistance.

[reformatt]

These batteries aren't intended to slide out. The battery is glued down, and the motherboard is then placed on top of the connector, and held down with adhesive. You either take it out or lift it up slightly with a pry tool to allow the battery to pop over the screw hole. Apple products are not designed to be repaired easily, and in fact come with a lot of booby traps for the uninitiated.

The reason it is boot looping as the iPad can't talk to the battery's gas gauge lines. Battery is either faulty or the pins on the motherboard side were damaged when you pulled the battery. On other iPad models, failure to disconnect the battery would have a high probability of blowing the backlight filter when you plug in the LCD. The idea is to slightly lift up the board, and place an insulator between the battery terminals and board. But then some wouldn't lift up the board and just slide a pry card in, damaging the batteries contacts on the motherboard.

I don't work on iPads anymore myself. Had enough of dealing with products held together with glue. Life is too short.

[trepachka]

With this iPad, yes, the battery is glued down. The section where the battery is attached to the motherboard, it has a ring. The battery slides into the socket and the ring opening matches to that of the motherboard. It is then screwed on.

I can tell you the battery is being charged without any issues. My gauge is showing about 13w is drawn when the battery is attached. Without the battery, iPad draws around 3.6W of power.

[reformatt]

The gas gauge line is BATT_SWI and is used to communicate with the controller in the battery. Absence of data on this line causes a panic condition and a reboot is asserted because of it. Can be either from a bad connection, broken pin or faulty battery.

My recollection from when I was doing these that it would at least boot to the springboard and reboot a few minutes later and was poor contact with the gas gauge pins. Boot looping to Apple logo only is generally a bad battery in my experience.