“Is a battery for a Panasonic Lumix DMC FZ18 compatible with a battery for a Panasonic Lumix DMC FZ7 I have a Panasonic FZ18 camera which uses a CGR-S006A battery. I need an extra battery and my friend has a Panasonic FZ7, her battery is CGR-S006E. Would this be compatible with my camera (obviously i don't want to risk it if not!!). Many thanks, Vanessa.”