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If it is about 6 years old, then it almost certainly has suffered internal battery failure.
Rechargeable batteries of all types and technologies used in portable electronic devices nowadays, all fail to hold charge, or fail to deliver enough power, by and by... usually after 1 1/2 years, rarely sooner. 6 years is a reasonable time.
Would you want to try to replace the battery yourself?
OK, then. At 6 years old, there is no chance of voiding the warranty by opening the case.
You will need to open the case, and remove the battery without harming anything, then replace it with a new one:
which are both under $20.... though there are other more expensive vendors and sources also.
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