It takes 4 x AA batteries. Are the battery contacts on the compartment door, and the battery contacts in the base of the compartment clean and shiny. Usually when batteries leak, they cause oxidization on the metal.
The camera does have very specific requirements.
Batteries are required to operate the digital camera. At
first, load the batteries in the camera.
Compatible batteries
AA-size alkaline batteries (4) or AA-size Ni-MH
rechargeable batteries (4) (sold separately)
CAUTION
• Never use the following types of
batteries, as they could cause
serious problems such as battery
fluid leakage or overheating:
1. Batteries with split or peeling
outer casings
2. Combinations of different
types of batteries or new and used batteries together
• Do not use manganese, Ni-Cd or lithium batteries.
• Use the same brand and grade AA-size alkaline
batteries as those supplied with the camera.
https://www.manualslib.com/manual/54755/Fujifilm-Finepix-S8000fd.html?page=16#manual
And on the next page it shows the polarity two up, and two down. If those weren't correct, you would be on reduced power.
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