Mains Powered Soap: Getting Rid of Battery Waste
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We have a battery powered automatic soap dispenser that you can use without touching it. Sure, it's a stupid item that probably shouldn't exist, but since it already exists, it would be reasonable to keep it working as long as possible. The upside is that it stays clean, but the downside is that it eats through batteries like nobody's business. The thing requires 4 AA batteries and, crucially, rechargeable 1.2 volt NiMH batteries won't work. I'm not going to be buying separate regular batteries just for this device, so of course I had to hack it.