I am in possession of two Pen PL1, which I use mainly when traveling. Since I can not be sure all of being able to recharge my batteries, I tentatively put me to two of the batteries and could initially see anything negative. After less than half a year and more charging cycles, the batteries are but so swollen that they no longer fit into the battery compartment and then must be disposed of. To avoid damage to the cameras, I'm not interested in a replacement, but the whole book under dues from and get you original batteries.