vic7767 wrote:Due to the nature of the charging system on the 500, 600, and 700 model Roombas it is vert difficult to design a LI-ion battery solution without the err 5 issue. If the battery built and the charger and 500 model Roomba are matched well then there is a successful charging process. That happened to me one time using a 535 Roomba and some 1050 mAH cell phone batteries.
Things are getting clear now. ProTech Robotics once sell the li-ion batteries for the 500 series and now they don't. Seemed they had issues with them.
Someone said when charged directly, no error code. But when on home base, err5 comes in. No wonder iRobot
sticked with NiMH batteries.
Maybe a circuit can be integrated to prevent the err5???