The item mentioned above is a high-quality, compatible battery for your EOS 40D. It is an excellent replacement battery for your existing or defective EOS 40D. It can also serve as an additional spare battery for on-the-go use. Handling and charging are as straightforward as usual with the standard power supply or charger. A high level of safety is provided by the protective electronics against overcharging and short circuits. The use of high-quality cells allows for a greater number of charge-discharge cycles, resulting in a longer lifespan for your new EOS 40D battery. Quality is our top priority, which means all batteries are new and unused. Our own quality assurance ensures a high standard of quality. Note: Unless we explicitly state that this is an original product, we supply a compatible product. This means it is by no means an original product from the manufacturer and is therefore not produced or recommended by them. All brand and product names belong to their respective owners and are only used for compatibility description.