1.5 Volts Lithium batteries

jpanhalt

Joined Jan 18, 2008
11,087

#12

Joined Nov 30, 2010
18,224
I can certainly imagine several good uses for a 5 volt battery the size of a AA.
Lots of back-up batteries and portable instruments would like that kind of power source.
 

#12

Joined Nov 30, 2010
18,224
Yeah, I know. I already find (3) AA batteries in a lot of digital thermostats, but a 5 volt battery the size of a single AA battery would reduce the size and probably lower the cost. Then there are digital multi-meters that would like 5 volts for their logic circuits instead of stepping down a 9V battery.
 

Georacer

Joined Nov 25, 2009
5,182
Given the amount of 5V circuits in the tinkerer community, I also wonder why there isn't a 5V battery as well. There would be as much use for it, as there is for the 7805 regulator now.
 

ISB123

Joined May 21, 2014
1,236
They probably have reason for that.
If they produce 5V battery 7805 sales would drop but if they keep 9V battery then they got a sweet spot since you need 9V and 7805.
 

tcmtech

Joined Nov 4, 2013
2,867
The potentially fatal flaw I see in making a direct 5 volt battery is voltage sag issues. Most 5 volt powered logic circuits tend to be rather fussy about how far above or below the 5 volt ideal they use you can go.

As far as low power compact sized goes two 3 volt lithium button or coin cells plus a set of surface mount diodes tends to get you pretty close to that 5 volt working range with minimal power loss all in as tiny of package as you want.
 
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