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2004 civic. Battery was completely dead. I put a 10 amp charger on it and forgot about it for 3 days. Now it starts and immediately dies. Giving it throttle doesn’t help, neither does holding the key in start position. Have I burned something out? If so, what could it be?

 
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Any fault codes?

 
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I don’t know how to check them

 
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By using a code reader.

Take your battery somewhere like autozone and get it load tested. If it stayed dead and then got cold, it probably swelled which makes it useless.

 
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It seems fully charged. Starter turns engine fast
it starts immediately and then dies

 
Rep Power: 367

chargers nowadays have a function to maintain after the battery is charged, if yours is new, it should not cause issues with battery

 
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im going to get a new battery tomorrow. But I really don’t expect it to solve my problem

 
Rep Power: 367

checked fuses? Did you change any engine sensors? Timing belt at right timing?
I would have expected to see some codes in this case too.

 
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im going to have to get a code reader. It was running great when I parked it. It acts like it loses fire as quick as it starts. I’m going to try a new battery tomorrow. The old one went down overnight. I checked all the fuses under the hood. Is there one in the interior panel that could cause this?