Battery choice - Electronic Circuits Projects Diagrams Free

AtomSoft · 7th November 2009, 01:34 AM

Hey guys we all probably used a coin cell battery for etc clocks but is it better to use 2 AAA batteries when size isn't a issue?

audioguru · 7th November 2009, 01:57 AM

The size of a battery cell determines how much stuff is inside which determines how long it can supply a certain amount of current.

Two AAA alkaline cells can supply 25mA for 40 hours when the voltage has dropped to 2.0V.
Two alkaline button cells can provide 25mA for a couple of minutes or less when the voltage has dropped to 2.0V.

AtomSoft · 7th November 2009, 02:03 AM

thanks!!!!

Sceadwian · 7th November 2009, 02:29 AM

If size isn't an issue for really low current drain applications think Lithium. Not the common Li-poly cells that are in everything now days, but Lithium primary cells. The have really low self discharge rates, and extreme shelf life, 10 years or better under discharge or not for backup applications. Still able to supply current up until it's end of life for short duration.

crutschow · 7th November 2009, 05:48 AM

In general, for a particular battery chemistry, (alkaline, lithium, etc.) the larger the battery, the lower the cost per watt hour of energy. So it's generally a trade-off between the cost of battery operation and the room you have for a battery. For alkalines, the AA size seems to be a good compromise for many electronic applications.

Sceadwian · 7th November 2009, 05:09 PM

Lithium primaries comes in 1.5volt output in a AA form factor, they're much more expensive than alkalines but for backup applications where size isn't an issue they're king.

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7th November 2009, 01:34 AM	#1
AtomSoft	Battery choice Hey guys we all probably used a coin cell battery for etc clocks but is it better to use 2 AAA batteries when size isn't a issue? __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

7th November 2009, 01:57 AM	#2
audioguru	The size of a battery cell determines how much stuff is inside which determines how long it can supply a certain amount of current. Two AAA alkaline cells can supply 25mA for 40 hours when the voltage has dropped to 2.0V. Two alkaline button cells can provide 25mA for a couple of minutes or less when the voltage has dropped to 2.0V. __________________ Uncle $crooge

7th November 2009, 02:03 AM	#3
AtomSoft	thanks!!!! __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

7th November 2009, 02:29 AM	#4
Sceadwian	If size isn't an issue for really low current drain applications think Lithium. Not the common Li-poly cells that are in everything now days, but Lithium primary cells. The have really low self discharge rates, and extreme shelf life, 10 years or better under discharge or not for backup applications. Still able to supply current up until it's end of life for short duration. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

7th November 2009, 05:48 AM	#5
crutschow	In general, for a particular battery chemistry, (alkaline, lithium, etc.) the larger the battery, the lower the cost per watt hour of energy. So it's generally a trade-off between the cost of battery operation and the room you have for a battery. For alkalines, the AA size seems to be a good compromise for many electronic applications. __________________ Carl Curmudgeon Elektroniker

7th November 2009, 05:09 PM	#6
Sceadwian	Lithium primaries comes in 1.5volt output in a AA form factor, they're much more expensive than alkalines but for backup applications where size isn't an issue they're king. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."