battery keeps loosing charge

I just bought a new battery ,and had the battery and alternator checked and
the tech said they are both good . I had a plug in the hitch ,but have
since unplugged it and the battery is still loosing charge

PLATTE proclaimed:

I just bought a new battery ,and had the battery and alternator checked and
the tech said they are both good . I had a plug in the hitch ,but have
since unplugged it and the battery is still loosing charge

Any particular year, make, model vehicle? Engine type?

How much charge is it losing?

How are you measuring the charge loss?

Did that tech do a key off power drain measurement? If not, go find a
tech that knows what they are doing.