Hi, Jinx > Some info here that I think fits the bill > > http://www.rampower.co.nz/technical.html > > It's not envisioned or desirable to have the cell flat. Even when > called on to perform, it need supply only 85pA > > A super cap would have been a possibility, but the cap leakage > and the necessary associated regulator circuitry consumption > rules it out for long-term (a day or two ?) use Be VERY carefull... I tried rechargeable alkalines like that one and in about 4 months inside the equipament it started to put that "blue thing" out. They leak exactly like the non rechageable alkaline cells ! They are great for toys but not for equipament that needs backup. The super cap might be a better idea. It has been some years since I tried them, they may have changed, but check it out before. The "blue stuff" corrodes everything inside the equipament. Best regards, Alexandre Guimaraes -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics