Have you considered using a battery designed for long term power, like the ones used in Metering? There is at least one manufacturer that uses a special super-cap in parallel to achieve momentaneous high peak currents and minimal leakage. Search Tadiran batteries. They state life times over 15ys. I am not affiliated with them, just a happy user. S=E9rgio Sena On 20 June 2012 21:38, V G wrote: > On Wed, Jun 20, 2012 at 4:08 PM, M.L. wrote: > >> The 2450 is designed for higher discharge bit is also a lot larger than = the >> 2032. Check it out. Also maybe use a super cap in parallel with a 2032 ( >> switch in with fet) >> > > I wonder how much of the battery's energy one would waste by charging the > super capacitor and letting it leak when the device is not in use, then > charging it back up again next time. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 A. S=E9rgio Sena www.antoniosergiosena.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .