SuperCap 9V battery - hack a day - www.hackaday.com _
SuperCap 9V battery - hack a day - www.hackaday.com _
Need to look at some more ultra caps. Might be a good lightweight alternative to batteries.
9V batteries are often found in devices that aren’t used very often. If you use a NiCd rechargeable battery you may find it completely discharged by the time you need it.