[RoadAmerica]

I let my 1989 C4 sit for 3 days as I worked three 12hr shifts at the hospital. I walk to work. I drove the car all weekend and had zero problems. On my day off I went to start the car and it was dead. The central lock had no current and the ding noise never came when I inserted the key. I replaced the battery and now the battery looses a 1/100 of a volt every few seconds. I cannot let my car sit for more than a few hours without starting. The alternator is good. I started pulling fuses to narrow the problem down. Then I disconnected the battery neg terminal and held the meter on the battery posts. The voltage was still dropping. I think the replacement battery is bad. Any help?