I have a portable rechargeable amplifier that was custom built for me when I was in Peru, it no longer makes sounds when unplugged, although an LED lights up. When plugged in to the wall, it emits sounds. [more inside]
posted by cloeburner on Jul 15, 2011 - 9 answers

My brother is looking for an inverter to use with a deep cycle battery while camping. [more inside]
posted by croutonsupafreak on Aug 12, 2007 - 8 answers

Have batteries in consumer electronics and laptops always recharged in less time than they discharged? If not, when did it switch to being the way it is now? [more inside]
posted by NotMyselfRightNow on Aug 17, 2006 - 7 answers

I have a laptop (Sony Vaio R505) with a lithium ion battery. Last night, I used the machine fine with out it being plugged into the wall (for about 2 hours). Today, when I tried using the machine after a full charge, it died within half an hour. I'm currently using XP with SP2 and google'd all the user groups. Any suggestions other than buying a new battery?
posted by phyrewerx on Sep 14, 2004 - 2 answers