Phone battery slow charge

My phone battery has been dying for half a year. It wouldn't charge inside the phone when the battery was low. I had to take the battery out to charge it.

After charging all night it'd still be at 80%. If I opened an app or swiped the screen too quickly or the phone was too warm, the phone would itself shut off. I thought I needed a new phone.

Today I bought a high-speed charging cable and that fixed my problem. Now my battery is fully charged.

Green light, woohoo!