> By the way the z3801 is off most of the year so the drains quite small. I think that's backwards. The battery is only used when there is no power to the GPS module. AAs are roughly 2800 mA hours. There are 8760 hours in a year. That's 319 microamp years. (How's that for a SI unit?) So that's 3 years if your GPS module takes 100 uA. I think that's way high. Anybody measured it? There is probably a strong temperature component. -- These are my opinions. I hate spam.

Hi The numbers quoted earlier (and they sound right) were 20 uA at 2.5V. That would be well under your 100uA. My *guess* is that self discharge / aging on a normal AA is going to limit things faster than a 20 uA drain. Now, if you have the more normal tiny coin cell involved with 1/10 or 1/100 that capacity and much lower self discharge …. Bob > On Nov 2, 2014, at 3:17 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > >> By the way the z3801 is off most of the year so the drains quite small. > > I think that's backwards. The battery is only used when there is no power to > the GPS module. > > AAs are roughly 2800 mA hours. There are 8760 hours in a year. That's 319 > microamp years. (How's that for a SI unit?) So that's 3 years if your GPS > module takes 100 uA. I think that's way high. Anybody measured it? There > is probably a strong temperature component. > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.