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Uses
 
Uses
 
*Provides power to circuits. At any time the power is equal to the voltage of the battery times the current. When the battery is not connected, the current and the power are 0.
 
*Provides power to circuits. At any time the power is equal to the voltage of the battery times the current. When the battery is not connected, the current and the power are 0.
*We will often use a wall-powered power supply in place of a battery.
+
*We will often use a power supply in place of a battery.
  
  
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Also the process of charging them up.
 
Also the process of charging them up.
 
Is it true that "almost all batteries don't perform to optimum until after 10 or so full charging cycles"?
 
Is it true that "almost all batteries don't perform to optimum until after 10 or so full charging cycles"?
 
== battery holder ==
 
 
With many modern electronic devices, the battery is often the single heaviest component, and one of the largest parts.
 
Also, it is often the only part designed to be replaced periodically.
 
 
* coin cell battery holder: Are you designing or soldering a PCB and you need battery backup? [[PG31 GPS USB Dev Board]] has a few tips. The µWatch [[uWatch]] takes a completely different approach to connecting coin cells to its PCB.
 
* 9 V battery holder: ... ''any tips?''
 
* AA battery holder: ... ''any tips?''
 
* ''What kind of battery and holder is appropriate for powering a sewn-on [http://hlt.media.mit.edu/?p=34 LilyPad Arduino] or [http://web.media.mit.edu/~leah/grad_work/diy/diy_tank.html wearable LED display] or other sewn-on wearable electronics?''
 
 
  
 
== battery test jig ==
 
== battery test jig ==
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Such a jig could conclusively prove or disprove the many myths and urban legends about batteries.
 
Such a jig could conclusively prove or disprove the many myths and urban legends about batteries.
  
* ''Can I do that with the [[Smart Battery Charger with Graphical Data Logger]] ?''
+
''Can I do that with the [[Smart Battery Charger with Graphical Data Logger]] ?''
  
 
* ''Can I do that with the [http://dansteingart.com/ardustat/ Ardustat] ?''
 
* ''Can I do that with the [http://dansteingart.com/ardustat/ Ardustat] ?''
  
 
* * Yes, yes you can.  DS
 
* * Yes, yes you can.  DS
 
* [http://lazytoad.com/teamtoad/battery.html "Team Toad: Battery Tests"]: empirical tests of real batteries with real motors.
 
 
== DIY UPS ==
 
 
The biggest batteries in my house are inside my UPSes.
 
Alas, sometimes I think they are not quite big enough.
 
Here are some links to people building custom UPS with bigger batteries than most off-the-shelf UPSes:
 
 
* Mike Howes. "Beating brownouts: building a super UPS". 2007. [http://tech.icrontic.com/articles/super_ups]
 
* "The DIY (or, if you must, "Ghetto") UPS" [http://www.dansdata.com/diyups.htm] via [http://hackaday.com/2005/02/07/diy-dual-conversion-ups/] "even though it makes rain look really cool, please do not stand in the rain holding the strobe."
 
* [http://zedomax.com/blog/2008/03/22/diy-hack-how-to-make-your-own-ups-for-your-computer-and-other-peripherals-during-power-outage/]
 
* "max". "DIY HACK – How to make your own UPS for your computer and other peripherals during power outage". 2008. [http://zedomax.com/blog/2008/03/22/diy-hack-how-to-make-your-own-ups-for-your-computer-and-other-peripherals-during-power-outage/]
 
* "12V DC micro UPS system": DC input (up to 18 VDC), 12 V battery charger, and DC output (connected to either the input or the battery). [http://forums.trossenrobotics.com/showthread.php?t=2818],[http://www.mini-box.com/picoUPS-100-12V-DC-micro-UPS-system-battery-backup-system]
 
* BenjaminNelson. "48V UPS for DIY Solar PV System" [http://www.youtube.com/watch?v=ksMfLpR0ohE]
 
* "jacquesl". "DIY UPS, completed". [http://www.diyaudio.com/forums/everything-else/111165-diy-ups-completed.html]
 
  
 
== Further Reading ==
 
== Further Reading ==
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* [http://www.mouldy.org/rambles/The-Best-Batteries-In-The-World "The best batteries in the world..."] by ian 2006 ("rechargeable NiMH AA cells"?)
 
* [http://www.mouldy.org/rambles/The-Best-Batteries-In-The-World "The best batteries in the world..."] by ian 2006 ("rechargeable NiMH AA cells"?)
 
* [http://www.prc68.com/I/No6.shtml No. 6 Dry Cell]This is now sort of an old time thing
 
* [http://www.prc68.com/I/No6.shtml No. 6 Dry Cell]This is now sort of an old time thing
* [http://www.windsun.com/Batteries/Battery_FAQ.htm "Deep Cycle Battery FAQ"]
 
* (by Paul Hills ?) "Batteries". 2004. [http://robots.freehostia.com/Batteries/Batteries.html] (was: [http://homepages.which.net/~paul.hills/Batteries/BatteriesBody.html] ); also "Battery Monitoring" [http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html], with an emphasis on robot competitions.
 
* "Notes on Batteries" has a nice little Javascript calculator for "Peukert's Formula".[http://www.gizmology.net/batteries.htm]
 
* (by Constantin von Wentzel ?) "How Lead Acid Batteries Work" says that "One of the main reasons why lead-acid batteries dominate the energy storage markets is that the conversion efficiency of lead-acid cells at 85%-95% is much higher than Nickel-Cadmium (a.k.a. NiCad) at 65%, Alkaline (a.k.a. NiFe) at 60%, or other inexpensive battery technologies." Concludes that AGM batteries are better for marine application. [http://www.vonwentzel.net/Battery/00.Glossary/]
 
* TimAnderson. "Easy Test of Battery Amp-Hours Capacity". [http://www.instructables.com/id/AmpHourTest/]
 
* "PowerStream's Power Humor Page" [http://www.powerstream.com/powerhumor.htm]
 
* Isidor Buchmann. [http://www.medicalelectronicsdesign.com/article/battery-fuel-gauge-factual-or-fallacy "Battery Fuel Gauge: Factual or Fallacy?"] 2012. Describes a way to measure state-of-charge with a magnetic field sensor.
 
* Isidor Buchmann. [http://www.medicalelectronicsdesign.com/article/be-aware-risk-management-batteries "Be Aware of Risk Management in Batteries"] 2012. Describes poorly understood characteristics of batteries: capacity fade, self-discharge, and temperature effects.
 
 
  
 
[[Category:Components]]
 
[[Category:Components]]

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