How to extend battery in Samsung Galaxy Tab 3 7.0 3G

Firstly i have started with purchasing 1 battery of same kind and charging both fully by connecting on tablet

Then pasted these two batteries with double sided tape with little zigzag type structure as it will helps to reconnect screws later. And then solered both batteries sockets in parllel connection with jumper wires and further glued them with glue gun,u can also use tape for covering wires

Now checking the connection by attaching on tablet socket and power it on....... bingo it started,now check out for if there is increasingly in temperatures on battery by touching them

If all the are things set then properly covere the back of tablet with insulating tape

Now restart it

Enjoy your increased backup. ...i have used it continuesly for 13 hrs and yet 13 % was remaining

Uploaded steps in pic