content: I purchased two batteries and found that I needed both to completely edge and trim my lawn. A charge only lasted 15 minutes or so and I recharged both after each use. At the beginning of the second year of use, neither battery provided the needed power to cut effectively. I decided to try draining a battery completely, but still no luck getting the necessary power to cut through thick grass. I'm very disappointed because I love the trimmer, otherwise, but it's useless without a strong battery.