Thanks to information that Flecc has provided, I know that the Panasonic unit is waterproof when the bike is being used. But is it is still waterproof when the battery has been removed? The battery contacts are obviously exposed and I wasn't sure whether it was a good idea to allow these to get wet - also whether any other routes are opened up for water to get in. I have to leave my bike outside my workplace and remove the battery for charging. Today was the first day since I have had the bike that there has been signs of rain. I've wrapped a carrier bag round the hole to give some level of protection.
Chris
Chris