While searching for replacement battery for my e-pl3 (BLS-1) I came across two types of BLS-1 replacement- one set with 7.2V and the other with 7.4V. My original battery is of 7.2V. Two questions in my mind. 1. Is it safe to use the 7.4V replacement batteries? 2. Can the BLS-5 batteries be charged with the BCS-1 charger? Anybody with any experience with these batteries please share. Thanks.