Nexus 7 Faulty Charge Port & Battery

Finally got around to repairing my Google Nexus 7, which for months has been failing to hold a full charge, and also had a dodgy charge port connection.
*MY TEST GEAR ETC*
Solder :- Multicore & Warton Metals 60/40, 63/37 -- Diameters - 0.25mm / 0.4mm / 0.5mm / 0.7mm
Solder Pastes :- Amtech VS-213-A-TF & NC-559-V2-TF
Bench Multimeters :- Keysight 34465A / Keithley DMM6500
H/Held Multimeters :- Keysight U1253B / U1252B / Fluke 289 / Fluke 28II
Power Supplies :- TTi QL355T / Keithley 2230G-30-1 / EA-PS5040-40A
Multi function Tester :- Fluke 1653B
Electronic Load :- ARRAY 3723A
Oscilloscope :- Rigol-DS2200
Spectrum Analyser :- Rigol-DSA805-TG
Signal Generator :- Rigol-DSG4162 & DG1012
Frequency Counter :- Racal-Dana 1998
Variac :- Carroll & Meynell 8A
Microscope :- GT Vision Research Grade GXM-XTL3TV1
Solder Station :- Pace ST100
Rework Tweezers :- Pace MT-100 MiniTweez
Hot Air :- Metcal HCT-900-21 - 320W Hot Air Station
Hot Air :- Metcal HCT2-200-21 - Hot Air Pencil
Screwdrivers :- Wera & Knipex
Pliers & Cutters :- Knipex -Various Models
Tweezers :- Lindstrom & Ideal-Tek
Scissors :- Fiskars Non Stick Micro - amzn.to/2LByYNZ
Ultrasonic bath :- GT Sonic (6 Litre)
Torch :- Olight S1A
High Temperature PCB Jig/Fixture
Switch Cleaner :- Servisol Super10
Freeze Spray :- Servisol Freeze It
*CAMERA GEAR*
Cameras :-- 2x Panasonic HC-X920
Sound Mixer :-- Sound Devices MixPre-D
Sound Recorder :-- Tascam DR-100 MKII
2x Manfrotto 244RC Variable Friction Arms - amzn.to/2qxzl4W
2x Manfrotto Super Clamps - amzn.to/2PolGpn
Video Capture Card:- Elgato Game Capture HD60 Pro - amzn.to/343Ayif
*EDITING SOFTWARE*
Davinci Resolve Studio 16
iZotope RX7
Youlean Loudness Meter
Handbrake
Adobe Photoshop CC
Adobe Audition CC