A good sealed lead acid battery (Check www.mouser.com) should meet your requirements well. Don't buy a car battery. You are not limited by weight IIC. Cost will be lower for sealed lead acid batteries Charging a lead-acid battery is really simple and they are hard to destroy Nicads are finicky, take special chargers, and can die unexpectely from not charging correctly. They are also expensive. OTOH, they are lightweight and store more enegry per Kg. --Lawrence ----- Original Message ----- From: "sam woolf" To: Sent: Friday, July 19, 2002 11:31 AM Subject: [OT] lead acid vs niCad batteries > I need to get some rechargeable batteries for powering an art exhibit. The > batteries are powering six constantly on sensor units which each draw 16 mA, > and which occasionally cause small relays to be triggered. The exhibit needs > to be able to operate without power problems for 8 to 10 hours, and can be > recharged at night. Not sure whether nicad or lead acid batteries or > some-other are the most suitable. Would appreciate an outside opinion.. Am > slightly worried about high current possible with lead acid batteries could > somehow fry my electronics, but am also worried that nicad batteries won't > last long enough, or that they will suffer from 'memory effect' and leave > the exhibit conked out in the middle of the day. > Any thoughts? > > > _________________________________________________________________ > Join the world s largest e-mail service with MSN Hotmail. > http://www.hotmail.com > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body