GTA02 RTC backup battery

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== Replace by capacitor ==
 
== Replace by capacitor ==
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RTC backup battery (BAT1701: HB414-IVO1E) can be replaced by [http://en.wikipedia.org/wiki/Electric_double-layer_capacitor electrochemical double layer capacitor (EDLC)], like [http://search.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&site=ca&keywords=XH414H-II06E&x=0&y=0 XH414H-II06E (apparently obsolete, not recommended for new design)] or [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=EECEN0F204 EECEN0F204] ([http://www.panasonic.com/industrial/components/pdf/ABC0000CE19.pdf datasheet]). These supercapacitors have much longer lifetime and they are less sensitive to heat from solder iron than lithium baterries.
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RTC backup battery (BAT1701: HB414-IVO1E) can be replaced by [http://en.wikipedia.org/wiki/Electric_double-layer_capacitor electrochemical double layer capacitor (EDLC)], like [http://search.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&site=ca&keywords=XH414H-II06E&x=0&y=0 XH414H-II06E (apparently obsolete, not recommended for new design)] or [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=EECEN0F204 EECEN0F204 (500 Hrs @ 60°C)] ([http://www.panasonic.com/industrial/components/pdf/ABC0000CE19.pdf datasheet]). These supercapacitors have much longer lifetime and they are less sensitive to heat from solder iron than lithium baterries.
  
  
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* http://lists.openmoko.org/pipermail/community/2010-October/063559.html
 
* http://lists.openmoko.org/pipermail/community/2010-October/063559.html
 
* http://lists.openmoko.org/pipermail/community/2010-October/063657.html
 
* http://lists.openmoko.org/pipermail/community/2010-October/063657.html
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==Alternatives:==
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1000 Hrs @ 60°C:
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* DSK-3R3H224, KS-3R3224 (search digikey.com) ? What terminal type?
  
 
[[Category:Neo FreeRunner reworks and mods]]
 
[[Category:Neo FreeRunner reworks and mods]]
 
[[Category:Battery]]
 
[[Category:Battery]]

Revision as of 20:56, 29 December 2010

RTC keeps the current time while Neo FreeRunner is off or suspended. Rechargable lithium backup battery should keep clocks running for hours when main battery is flat or removed, but it has limited lifetime.

Replace by capacitor

RTC backup battery (BAT1701: HB414-IVO1E) can be replaced by electrochemical double layer capacitor (EDLC), like XH414H-II06E (apparently obsolete, not recommended for new design) or EECEN0F204 (500 Hrs @ 60°C) (datasheet). These supercapacitors have much longer lifetime and they are less sensitive to heat from solder iron than lithium baterries.


Alternatives:

1000 Hrs @ 60°C:

  • DSK-3R3H224, KS-3R3224 (search digikey.com) ? What terminal type?
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RTC keeps the current time while Neo FreeRunner is off or suspended. Rechargable lithium backup battery should keep clocks running for hours when main battery is flat or removed, but it has limited lifetime.

Replace by capacitor

RTC backup battery (BAT1701: HB414-IVO1E) can be replaced by electrochemical double layer capacitor (EDLC), like XH414H-II06E (apparently obsolete, not recommended for new design) or EECEN0F204 (datasheet). These supercapacitors have much longer lifetime and they are less sensitive to heat from solder iron than lithium baterries.