Cellphone battery : Problem in charging, what it could be?

I'm using Motorola Razr V3re for the last few years. Now a days, while trying to charge, I've to adjust (or press) the battery, and then it starts charging.

Could it be battery gotton old? Or charger needs to be replaced? Or connections inside the phone have become old?

I know the phone is old, though for reasons, trying to get it working.

Thanks.
I didn't find the right solution from the internet.
References:
- http://ift.tt/2pL5jZ0
- Fire Suppression Video Examples

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