Before, I was curious about the inside of it. But it's really common as other batteries. The only difference is that it has a sealed covering. This adds some mystery to the battery. In daily usage, there are some tips that we should follow. Otherwise, it has many symptoms. Then you will keep it for longer lifespan. Though dell W1605 Battery has got strike, I can try to handle it by myself as my friend told me how to repair it. But this is not a try, so you should be cautious if you want to have a try. It's full of surprising but also dangerous. You might ruin your battery at worst.