friends moped battery issue

[Pol Anorl]

his moped works fine the batterys been fine but in the past 3 months its died 3 times randomly.

It charges up fine but he got home erlier and went to go out about 4-5 hours later and the battery was flat.

Any ideas what the issue is?

checked all wiring seems to be fine.
battery dosen't look too old although the bike is now 6 years old.
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[Efes123]

Here's an excellent Q&A to diagnose battery problems.

https://www.electrexworld.co.uk/pdfs/Troubleshooting-3P-PMG-&-RR.pdf
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[cb1rocket]

get a multi meter set to amps and check for current draw when the bike is off.

On the other hand can be a shit battery, is it a shit one by chance, what make?!