Iphone won't charge even with new cable & new battery?

Iphone won't charge even with new cable & new battery?

You need to get a NEW BATTERY…

I wanted to give my dad a present so I bought an Iphone 3GS and fixed it up
Everything works perfectly except it doesn't charge

If I turn the phone off and plug the charger it turns on
that means it detects the power but after the home screen shows up there's no charge

The cable is new and the battery is completely new

I've tried resetting with no luck & my computer doesn't even detect it

Does anyone have any ideas?

Don't tell me to upgrade and go buy an Iphone 6 or to replace the battery
it's new and the cable is new and I'm too poor to buy an iphone 5 or 6

come on please help me out I just want to make my dad smile

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