just wondering how I replace a battery for a 2000 c 280

Should be in your owners manual.

Steve

If its the same as my c220, us pry the remote open using a dime. It should pop open revealing the nickel-size battery inside.

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2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
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Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa

Dont go prying. If it is a Smart-Key release the spare key by sliding the tab over, you will find a gray bar in the opening, slide that and it should open like a drawer (smart-key has no mechanical key that fits into ignition, has plastic end)