I have an 05 Roadster that has been in storage since last October.About a month ago I realized the battery was completely down,it turns out that the park light switch had been left in the on position.I disconnected the negative terminal and charged the battery back up. Now when I connect the negative terminal bacvk to the attery there is a small spark.If you leave it connected for about 10 minutes,then disconnect and touch it again there is no spark.If you leave it disconnected for any lengh of time ,when you touch it to the battery it sparks again.Anyone have any explanation as to what is happening ???? Thanks

 

What you have is normal for any newer modern car. It takes a certain minimum amount of energy to keep memory items charged. Many owners that store their car for long periods of time keep a battery "maintainer" or trickle charger hooked up. James

 

Thanks James I wondered if something like this was the norm,Thaanks again

 

Is this the original, white battery? It may continue to give you problems. Time to replace it.

 

Do not leave it on a trickle charger for long periods. Recommend a float charger or battery tender which maintain the charge but do not continue charging. You can find them at auto stores, Battery Plus, or online (usually the cheapest source at ~$7/each). Google and you will find a ton of sources.