Ron, You will probably want to check for reverse charging and discharging paths and problems as well. Not a clue what the failure symptom is on those. Gary
-----Original Message----- From: ron_du...@agilent.com [mailto:ron_du...@agilent.com] Sent: Tuesday, September 19, 2000 10:26 AM To: emc-p...@ieee.org Subject: N-MH Batteries Hi, I am in the process of qualifying a product the uses a nickel metal hydride (N-MH) battery. It is shrink wrapped and appears to be four AA cells in series. the rating is 4.8 volts, 1100 mAh. My standard requires a fault analyses of the charging circuit. As I have had no experience with N-MH batteries I can only guess what the expected outcome will be when overcharged. The faulted charging circuit could be either 6.5 volts at 2 amps, or 9 volts at 1 amp. I have only one sample to test so I can't afford to make a mistake. What will I expect to see? Does the N-MH battery come with a built in vent? If so, does the vent release toxic, flammable, or any other hazard? Is there a chance of explosion? There appears to be a fuse under the shrink wrap. Is it to prevent high current in the event of a short? Our could it be a thermal device to prevent overcharging? Any other hints or advice? Ron Duffy Agilent Technologies Colorado Springs Division. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org