Charging lithium ion battery?

Question

My ageing smartphone (an HTC Touch Pro 2, running Windows Mobile 6) has suddenly developed the show-stopping fault of refusing to charge any of my five batteries. The smartphone itself is almost certainly faulty (I suspect an internal solder joint issue) but before I abandon it I want to try charging the batteries externally.

With my DMM I've identified the two (outer) contacts of the four that must be the 0 and +V terminals. They're reporting DC voltages of 3.7,

3.7, 3.6, 3.3 and zero respectively. So I could improvise a holder to get current into them.

What method should I use and what precautions should I take please?

Phil Hobbs · Accepted Answer

Buy another one on eBay and use it for charging batteries?  Or maybe  there's somebody selling a combined phone/spare battery cradle?  (I had  one of those for my old Blackberry 8900.) Cheers Phil Hobbs --  Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net

Jasen Betts · Answer

Use a battery charger designbed for lithium ion cells: search your favourite online marketplace.

if you want to make something yurself you can get current limited buck converters for a few bucks that could be used with a 5v supply to charge these cells.

terrypingm · Answer

Thanks both. Went for the eBay option, and ordered a new TP2 this morning f

I've been using a program to backup everything daily to the TP2's SD card, so hopefully I will be able to transfer usage to the new device.

Drifting OT, I'd have gone for an iPhone, but the main reason for my origin al choice remains valid. My major app is Memory-Map. I use it on my PC and have a big investment in maps. Essentially, I use the TP2 as a GPS device f or walking, plus occasional phone and internet capabilities. Unfortunately the app under iOS, which I use on my iPad, is markedly inferior to the WM v ersion on the TP2. A continuing dilemma therefore.

Terry, East Grinstead, UK

Charging lithium ion battery?

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