powering apple ipad 1st gen without battery from power supply

got a 1st gen ipad (A1337)

when i plugged it into a charger

the screen start blinking dimly 

opened it up using a flat screwdriver 

checked the battery using a multi meter

voltage was zero volts and for any battery its not good news

seeing the prices for a replaceable battery 

i decided its not worth the money to buy a new battery

and that im going to use a 5V 2A usb charger i have

so i used a cutting knife to cut around the battery carefully

cut carefully along the green line

then i de-soldered the two dead battery cells

soldered four wires to the battery pads after checking the polarity

stripes is positive (+) and solid is ground (-)

i drilled two small holes at the side of the ipad for the wires

connected two diodes to the two positive wires

in order to decrease the voltage from 5v to about 4.3v

and two resistors between the positive and the negative wires

just to keep a small load on the diodes

the ipad still needed two quick jump-starts to boot
momentary connect and disconnect the usb charger

first jump-start showed an empty battery logo 

second jump-start started the ipad

success

now i have a useless 1st gen ipad running from a usb charger

 notes:

*used both battery pads and not single to share the load of the power consumption

*could use any kind of li-ion cell batteries instead of hooking it up to ac adapter

*battery manager comparing the voltages of the left and right cells and consume more from the higher one