SupercapClever idea – use capacitors instead of batteries that could go dead in some devices – all in a 9volt form factor – “GoldCap capacitors offer an interesting alternative power source when compared to conventional disposable or even rechargeable batteries. They can be charged very rapidly and can also deliver a high peak output current. Their voltage however is quite low so a little electronic assistance is necessary to raise the output voltage to a more useful level.” [via] Link (PDF).