Re: [WikiReader] Battery Life
On Saturday 12 December 2009, David Garabana Barro wrote: O Sábado, 12 de Decembro de 2009, Jeff escribiu: Alkaline, the original energizer batteries that came with the device. I may have some NiMH batteries lying around somewhere, but I don't have any AAA lithium polymer nor a suitable charger. NiMH will be even worse. They autodischarge 5-10% on first day, and 1% every next day... That depends on the NiMH. Several manufacturers are now making them with very low self discharge (~5%/month). They work very well in applications where I previously stuck to alkalines, such as my Psion 5 which probably has a lot in common with the wikireader. I would also suggest trying a different brand of alkalines. The discharge voltage characteristic varies significantly between brands, and some devices stop working with the battery at a relatively high voltage. The Psion often works well with alkalines that other devices claim are dead. Even when the Psion has finished with them, they can be recharged with a suitable charger. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [WikiReader] Battery Life
At 17:50 + 13/12/09, Al Johnson wrote: On Saturday 12 December 2009, David Garabana Barro wrote: O Sábado, 12 de Decembro de 2009, Jeff escribiu: Alkaline, the original energizer batteries that came with the device. I may have some NiMH batteries lying around somewhere, but I don't have any AAA lithium polymer nor a suitable charger. NiMH will be even worse. They autodischarge 5-10% on first day, and 1% every next day... That depends on the NiMH. Several manufacturers are now making them with very low self discharge (~5%/month). They work very well in applications where I previously stuck to alkalines, such as my Psion 5 which probably has a lot in common with the wikireader. I would also suggest trying a different brand of alkalines. The discharge voltage characteristic varies significantly between brands, and some devices stop working with the battery at a relatively high voltage. The Psion often works well with alkalines that other devices claim are dead. Even when the Psion has finished with them, they can be recharged with a suitable charger. ... Hey! It is these batteries: http://en.wikipedia.org/wiki/Low_self-discharge_NiMH_battery Glenn ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [WikiReader] Battery Life
At 20:36 +0100 13/12/09, Glenn wrote: At 17:50 + 13/12/09, Al Johnson wrote: On Saturday 12 December 2009, David Garabana Barro wrote: O Sábado, 12 de Decembro de 2009, Jeff escribiu: Alkaline, the original energizer batteries that came with the device. I may have some NiMH batteries lying around somewhere, but I don't have any AAA lithium polymer nor a suitable charger. NiMH will be even worse. They autodischarge 5-10% on first day, and 1% every next day... That depends on the NiMH. Several manufacturers are now making them with very low self discharge (~5%/month). They work very well in applications where I previously stuck to alkalines, such as my Psion 5 which probably has a lot in common with the wikireader. I would also suggest trying a different brand of alkalines. The discharge voltage characteristic varies significantly between brands, and some devices stop working with the battery at a relatively high voltage. The Psion often works well with alkalines that other devices claim are dead. Even when the Psion has finished with them, they can be recharged with a suitable charger. ... Hey! It is these batteries: http://en.wikipedia.org/wiki/Low_self-discharge_NiMH_battery Glenn Here you have an older version with a list of battery names: http://en.wikipedia.org/w/index.php?title=Low_self-discharge_NiMH_batteryoldid=180982680 Glenn ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [WikiReader] Battery Life
O Sábado, 12 de Decembro de 2009, Jeff escribiu: Alkaline, the original energizer batteries that came with the device. I may have some NiMH batteries lying around somewhere, but I don't have any AAA lithium polymer nor a suitable charger. NiMH will be even worse. They autodischarge 5-10% on first day, and 1% every next day... -- David Garabana Barro jabber google talk ID:da...@garabana.com Clave pública PGP/GPG: http://davide.garabana.com/pgp.html signature.asc Description: This is a digitally signed message part. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
[WikiReader] Battery Life
I just burned through the 2nd set of batteries with my wikireader in a month and a half. I know I have averaged less than 15 minutes a day of on time, so I am getting no where near the 90 hours of battery life advertised. Don't know if I have a bad one, or if the code needs tweaking. Anyone else notice the battery life has not been so good? Jeff ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [WikiReader] Battery Life
On Fri, Dec 11, 2009 at 4:08 PM, Jeff jcolb...@netins.net wrote: I just burned through the 2nd set of batteries with my wikireader in a month and a half. I know I have averaged less than 15 minutes a day of on time, so I am getting no where near the 90 hours of battery life advertised. Don't know if I have a bad one, or if the code needs tweaking. Anyone else notice the battery life has not been so good? Jeff I don't have a WikiReader, but are you using Alkaline or Lithium batteries? The voltage of Alkali based batteries will decrease over time, so that often they will not be able to power an electronic device even though they are not fully discharged. Lithium batteries are best for things like the WikiReader because the voltage stays constant for the most part. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [WikiReader] Battery Life
Alkaline, the original energizer batteries that came with the device. I may have some NiMH batteries lying around somewhere, but I don't have any AAA lithium polymer nor a suitable charger. Alex Teiche wrote: On Fri, Dec 11, 2009 at 4:08 PM, Jeff jcolb...@netins.net mailto:jcolb...@netins.net wrote: I just burned through the 2nd set of batteries with my wikireader in a month and a half. I know I have averaged less than 15 minutes a day of on time, so I am getting no where near the 90 hours of battery life advertised. Don't know if I have a bad one, or if the code needs tweaking. Anyone else notice the battery life has not been so good? Jeff I don't have a WikiReader, but are you using Alkaline or Lithium batteries? The voltage of Alkali based batteries will decrease over time, so that often they will not be able to power an electronic device even though they are not fully discharged. Lithium batteries are best for things like the WikiReader because the voltage stays constant for the most part. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
