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my phone is lenovo p1ma40 phone from yesterday my phone is not charging well it takes lot time to charging what is the issue in that?

If you are using the same cable you always have been using, and before had a quicker charge, then you need to look at replacing you battery. The batteries, on all devices can and will fail over time. If it is taking a Lin time to charge, the battery cells are failing. There are no ifixit guides for this repair, try YouTube or you can find a local reputable repair shop to assist you with testing the battery and doing a replacement.