The kit is complete with everything you need, even a car charger. It has two batteries, both lithium ion so very dependable and hold a charge well. Shipped quickly; arrived quickly. If the battery in the charger comes out weak it's because the charger will turn off so it won't damage the battery. There will be enough of a charge on it to use while quickly recharging the other. I found this system works just like the official Olympus charger I have for my DSLR and it works very well keeping the batteries in great shape for long life. I expect the same from this and will upgrade the rating to five stars after a few months use with continuing good results. I think you can trust this product and this seller.