The Panasonic PV-GS19 Digital Video Camcorder has been around since 2005. If you are using one of these camcorders, don't get caught without battery power. Having a second battery handy gives some assurance that you can film as long as needed. For long trips or long video shoots, make sure to take an extra battery along.
The PV-GS19 uses the CGR-DU06 lithium-ion rechargeable battery. The TechFuel replacement battery, CGA-DU07, is compatible with the Panasonic CGR-DU06 camcorder and replaces the Panasonic CGR-DU06 battery. It will power your camcorder with 750 mAh.
Another option is to use the TechFuel CGA-DU14. This battery is the same as the CGA-DU07 but with 1500 mAh, double the battery's energy storage capacity. If you imagine a battery as a small fuel storage tank, which in a sense it is, the mAh a measure of how much "fuel" the battery holds. The higher the mAh rating the more electrical energy it can store.
The TechFuel travel charger is also compatible with all of these batteries and can replace the charger that came with your camera or be a second charger for travel or work.