phone restarting after using for a couple of mins

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iPhone 6

Repair information and guides for the iPhone 6 that was released on September 19, 2014. Model Numbers: A1549, A1586, and A1589

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so basically i have this Iphone 6.Its battery was not working properly so i bought a new battery,it worked fine but after one day I faced this issue

while using my phone after a couple of seconds/1 min my phone restarts on its own and doesn’t even charge.

So when the phone battery got low i plugged in my charger and it started charging and when it charged then it didn’t charge when i was using it

but again started charging when the battery dies

I’m so worried about this

kindly let me know the issue of this restarting and why my battery isnt charging and this is all happened after i changed my battery

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When troubleshooting charging issues, I would do the following (in order):

Always try another Lightning cable and charger, preferably Apple original or MFi certified units.
The Lightning cable 8-pin connector should be sitting flush with the housing and completely inserted. If it is not, there could be lint/dust/debris inside the port impeding a proper connection. You can clean it out with fine point tweezers or a dental pick. Just be careful not to damage the pins inside the Lightning Port.
The battery is the weakest link in the entire phone and certainly for charger related issues. Use a battery utility, such as coconutBattery (for Mac) or 3uTools (for Windows) to test the battery prior to removal. Anything less than 70% of design capacity will require replacement.
If the battery is in good condition, you can use a USB Ammeter to determine if the phone is really drawing current when it says it's charging. If it isn't drawing current, then I would change the Lightning/Charge Port.
If a new battery and charge port still don't resolve the issue, then you either have faulty replacement parts (possible) or a logic board issue. There is an IC (commonly referred to as Tristar) responsible for communicating with the charging device and uncertified chargers can damage it. Unplug the battery and connect a known-good (preferably Apple original or MFi) charger to the phone. A properly working phone will show an Apple logo and boot loop. If the Tristar IC is bad then the phone will not do anything.

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