Charging 2210 battery?
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From: Terry Pinnell on 21 Apr 2008 08:36 Using my Bluetooth-linked GPS unit with my iPAQ 2210 Pocket PC has the serious downside that the 1000 mAH battery runs out after 3 hours or so, nowhere near long enough for a day's walking/hiking. I'm looking at a higher capacity battery (3300 mAH) but that has the disadvantage that the 2210 would no longer fit its leather case. So an alternative I'd like to explore is using conventional (alkaline or NiMH) batteries. The lithium ion battery is apparently 3.7V. The DC power unit plug that fits the cradle I use when at home reads 5.28V on my meter. So a 6V set of 4 AA or C or D cells are candidates, possibly with a diode in series. Has anyone tried this please? I'm assuming there's protective circuitry to maintain the appropriate voltage anyway. Presumably the lithium ion battery in place would get charged simultaneously? Safely? -- Terry, East Grinstead, UK
From: Todd Allcock on 21 Apr 2008 09:52 At 21 Apr 2008 13:36:59 +0100 Terry Pinnell wrote: > I'm looking at a higher capacity battery (3300 mAH) but that has the > disadvantage that the 2210 would no longer fit its leather case. So an > alternative I'd like to explore is using conventional (alkaline or > NiMH) batteries. The lithium ion battery is apparently 3.7V. The DC > power unit plug that fits the cradle I use when at home reads 5.28V on > my meter. So a 6V set of 4 AA or C or D cells are candidates, > possibly with a diode in series. Has anyone tried this please? I've done it- just a straght 4AA pack with no diode and connected it to both an Audiovox Maestro (which used a 5.0V charger) and a Dell A im (used a 5.4V charger.) 4 alkaline AAs caused the Maestro's charge indicator to glow an undocumented red instead of the usual yellow (charging) or green (done.) I assumed that was some kind to overload warning so I disconnected it. The Axim didn't seem to mind it at all. Rather than play with diodes, I simply substituted rechargeable batteries (Ni-Cads and eventually Ni-MH.) Besides the advantage of reusability, they output 1.25v each instead of 1.5, so a set of four is a nearly ideal (ideal for the Maestro!) 5V. As a bonus, they're lighter than alkalines as well, and have a steadier voltage curve. (Alkalines drop voltage steadily as they are deeply discharge, so they drop below the needed 1.25v each before fully drained- Ni-Cd/Ni-MH put out a steady 1.25v almost until fully depleted.) > I'm > assuming there's protective circuitry to maintain the appropriate > voltage anyway. To a point yes- I blew a diode in my old Casio E-100 plugging in the wrong charger (12V!) in error. > Presumably the lithium ion battery in place would get > charged simultaneously? Safely? I've used my 4AA charger for years without incident. I built my first (the Maestro and Axim used the same size DC plug), then bought a nicer looking one off eBay. When I moved to my HTC Wizard (5.0v) I put a female USB plug on my old home-built one to use the Wizard's charge/sync cable with it.
From: Mike on 21 Apr 2008 14:21 Terry Pinnell wrote: > Using my Bluetooth-linked GPS unit with my iPAQ 2210 Pocket PC has the > serious downside that the 1000 mAH battery runs out after 3 hours or > so, nowhere near long enough for a day's walking/hiking. > > I'm looking at a higher capacity battery (3300 mAH) but that has the > disadvantage that the 2210 would no longer fit its leather case. So an > alternative I'd like to explore is using conventional (alkaline or > NiMH) batteries. The lithium ion battery is apparently 3.7V. The DC > power unit plug that fits the cradle I use when at home reads 5.28V on > my meter. So a 6V set of 4 AA or C or D cells are candidates, > possibly with a diode in series. Has anyone tried this please? I'm > assuming there's protective circuitry to maintain the appropriate > voltage anyway. Presumably the lithium ion battery in place would get > charged simultaneously? Safely? > Surely a better option would be to stick with your existing battery and case and use a plug in battery powered extender/charger, these can usually be picked up on ebay cheaply: http://tinyurl.com/47b8ke Mike
From: Terry Pinnell on 21 Apr 2008 14:35 Mike <mikeloveschampagneandrugby(a)googlemail.com> wrote: >Terry Pinnell wrote: >> Using my Bluetooth-linked GPS unit with my iPAQ 2210 Pocket PC has the >> serious downside that the 1000 mAH battery runs out after 3 hours or >> so, nowhere near long enough for a day's walking/hiking. >> >> I'm looking at a higher capacity battery (3300 mAH) but that has the >> disadvantage that the 2210 would no longer fit its leather case. So an >> alternative I'd like to explore is using conventional (alkaline or >> NiMH) batteries. The lithium ion battery is apparently 3.7V. The DC >> power unit plug that fits the cradle I use when at home reads 5.28V on >> my meter. So a 6V set of 4 AA or C or D cells are candidates, >> possibly with a diode in series. Has anyone tried this please? I'm >> assuming there's protective circuitry to maintain the appropriate >> voltage anyway. Presumably the lithium ion battery in place would get >> charged simultaneously? Safely? >> > >Surely a better option would be to stick with your existing battery and >case and use a plug in battery powered extender/charger, these can >usually be picked up on ebay cheaply: http://tinyurl.com/47b8ke > > > >Mike Thanks both. Mike: Great idea, hadn't known of those. Duly bought. -- Terry, East Grinstead, UK
From: ker_01 on 22 Apr 2008 08:56
Reading the comments below the article (lots and lots of them), there seem to ne several ideas on the best way to do this; http://www.hackaday.com/2005/01/20/how-to-make-a-usb-battery/2 HTH, Keith "Terry Pinnell" <terrypinDELETE(a)THESEdial.pipex.com> wrote in message news:th2p04t6ku8n7d73qffsmsvaapspkvplc4(a)4ax.com... > Using my Bluetooth-linked GPS unit with my iPAQ 2210 Pocket PC has the > serious downside that the 1000 mAH battery runs out after 3 hours or > so, nowhere near long enough for a day's walking/hiking. > > I'm looking at a higher capacity battery (3300 mAH) but that has the > disadvantage that the 2210 would no longer fit its leather case. So an > alternative I'd like to explore is using conventional (alkaline or > NiMH) batteries. The lithium ion battery is apparently 3.7V. The DC > power unit plug that fits the cradle I use when at home reads 5.28V on > my meter. So a 6V set of 4 AA or C or D cells are candidates, > possibly with a diode in series. Has anyone tried this please? I'm > assuming there's protective circuitry to maintain the appropriate > voltage anyway. Presumably the lithium ion battery in place would get > charged simultaneously? Safely? > > -- > Terry, East Grinstead, UK |