One battery, multiple tools: for what line of power tools did I see a commercial that featured one battery that you could switch out between the tools? [more inside]
posted by sjuhawk31 on Jul 31, 2009 - 12 answers

Why is there no bat-acitor? (hybrid battery/capacity w/best of both) Is there some limitation in physics, chemistry, materials, etc. that prevents it, or has it just not been invented yet? [more inside]
posted by bartleby on Jun 10, 2008 - 24 answers

What's the deal with NiMH AA and AAA batteries being 1.2V? [more inside]
posted by knave on Jan 11, 2008 - 32 answers

What is "modified sine-wave" power, and what will it do to my electronic devices? I have a portable Xantrex battery, and it came with a warning that certain rechargeable devices may not be compatible with its modified sine wave output. [more inside]
posted by Caviar on Jun 16, 2005 - 9 answers