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When I do sudo dmidecode -t 22 to get some information about my battery there is a field called maximum error

For my new battery maximum error is 15 % (cheap replacement from a web store) for my old one (original DELL battery) maximum error is 0%.

What does the term maximum error mean in this context and how can one interpret the 15 %?

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According to the DTMF SMBIOS documentation (p.97 of version 2.8.0):

Maximum error (as a percentage in the range 0 to 100) in the Watt-hour data reported by the battery, indicating an upper bound on how much additional energy the battery might have above the energy it reports having

So your DELL battery seems to have been more exact in reporting (or at least indicating it thought it was).

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