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Good Emergency Phone Charger

Started by David Eather November 24, 2011
I've been looking for one of these that is worth having. I tried plenty 
of lithium emergency battery charger packs. Most had appalling 
efficiency or were badly made or had batteries so bloated from 
overcharging the product couldn't be re-assembled after a visual 
inspection. Some had all the faults combined.

I looked at single cell AA - 5 volt chargers and again it was mixed. 
Some were too long and batteries needed small rare earth magnets to fit 
(true!), they were very slow at charging (no surprise) but most would 
actually discharge the phone if left on overnight(!!!) I found one that 
was OK but it is now out of stock.

So I was building my own for the bug-out-bag, when I found this:

http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432

It is only micro-usb but if that suits you this thing charges a 1000maH 
phone cell in about 3.5 hours and is OK if left on overnight $6!
David Eather wrote:
> I've been looking for one of these that is worth having. I tried plenty > of lithium emergency battery charger packs. Most had appalling > efficiency or were badly made or had batteries so bloated from > overcharging the product couldn't be re-assembled after a visual > inspection. Some had all the faults combined. > > I looked at single cell AA - 5 volt chargers and again it was mixed. > Some were too long and batteries needed small rare earth magnets to fit > (true!), they were very slow at charging (no surprise) but most would > actually discharge the phone if left on overnight(!!!) I found one that > was OK but it is now out of stock. > > So I was building my own for the bug-out-bag, when I found this: > > http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432 > > > It is only micro-usb but if that suits you this thing charges a 1000maH > phone cell in about 3.5 hours and is OK if left on overnight $6!
Got any info on the power drain when unplugged? Would make a nice 5V portable power supply if it didn't run the batteries down when not supplying 5V power.
On 11/24/2011 12:54 PM, David Eather wrote:
> I've been looking for one of these that is worth having. I tried plenty > of lithium emergency battery charger packs. Most had appalling > efficiency or were badly made or had batteries so bloated from > overcharging the product couldn't be re-assembled after a visual > inspection. Some had all the faults combined. > > I looked at single cell AA - 5 volt chargers and again it was mixed. > Some were too long and batteries needed small rare earth magnets to fit > (true!), they were very slow at charging (no surprise) but most would > actually discharge the phone if left on overnight(!!!) I found one that > was OK but it is now out of stock. > > So I was building my own for the bug-out-bag, when I found this: > > http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432 > > > It is only micro-usb but if that suits you this thing charges a 1000maH > phone cell in about 3.5 hours and is OK if left on overnight $6!
Slide back off cellphone. Insert spare battery. Slide back onto cellphone. End of story. Never buy a phone where you can't replace the battery. Never. What costs money in a phone? Connectors. The manufacturer pockets the savings and probably laughs that the fool that buys the product. The same goes for flash storage. If you can't add more flash, don't buy the phone.
David Eather wrote:
(...)

> So I was building my own for the bug-out-bag, when I found this: > > http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432 > > > It is only micro-usb but if that suits you this thing charges a 1000maH > phone cell in about 3.5 hours and is OK if left on overnight $6!
I am interested to know it's output voltage measurement, David. Thanks --Winston
On 25/11/2011 11:03 AM, mike wrote:
> David Eather wrote: >> I've been looking for one of these that is worth having. I tried >> plenty of lithium emergency battery charger packs. Most had appalling >> efficiency or were badly made or had batteries so bloated from >> overcharging the product couldn't be re-assembled after a visual >> inspection. Some had all the faults combined. >> >> I looked at single cell AA - 5 volt chargers and again it was mixed. >> Some were too long and batteries needed small rare earth magnets to >> fit (true!), they were very slow at charging (no surprise) but most >> would actually discharge the phone if left on overnight(!!!) I found >> one that was OK but it is now out of stock. >> >> So I was building my own for the bug-out-bag, when I found this: >> >> http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432 >> >> >> It is only micro-usb but if that suits you this thing charges a >> 1000maH phone cell in about 3.5 hours and is OK if left on overnight $6! > > Got any info on the power drain when unplugged? > Would make a nice 5V portable power supply if it didn't run the batteries > down when not supplying 5V power.
on my unit 5mA - 200+ Hrs standby with a pair of alkalines
On 25/11/2011 11:13 AM, miso wrote:
> On 11/24/2011 12:54 PM, David Eather wrote: >> I've been looking for one of these that is worth having. I tried plenty >> of lithium emergency battery charger packs. Most had appalling >> efficiency or were badly made or had batteries so bloated from >> overcharging the product couldn't be re-assembled after a visual >> inspection. Some had all the faults combined. >> >> I looked at single cell AA - 5 volt chargers and again it was mixed. >> Some were too long and batteries needed small rare earth magnets to fit >> (true!), they were very slow at charging (no surprise) but most would >> actually discharge the phone if left on overnight(!!!) I found one that >> was OK but it is now out of stock. >> >> So I was building my own for the bug-out-bag, when I found this: >> >> http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432 >> >> >> >> It is only micro-usb but if that suits you this thing charges a 1000maH >> phone cell in about 3.5 hours and is OK if left on overnight $6! > > Slide back off cellphone. Insert spare battery. Slide back onto > cellphone. End of story. > > Never buy a phone where you can't replace the battery. Never. > > What costs money in a phone? Connectors. The manufacturer pockets the > savings and probably laughs that the fool that buys the product. The > same goes for flash storage. If you can't add more flash, don't buy the > phone. >
Good advice for a normal situation. Spare battery $10 and that problem is solved. Not so good in a disaster situation. 2-3 days without mains power and trying to contact family / friends / people through an overloaded cell phone network - 2 batteries might not be enough. Even with power if you were stuck in an evacuation centre there is no guarantee you can get access to a mains outlet for three or four hours to recharge a battery.
David Eather wrote:
> On 25/11/2011 11:03 AM, mike wrote: >> David Eather wrote: >>> I've been looking for one of these that is worth having. I tried >>> plenty of lithium emergency battery charger packs. Most had appalling >>> efficiency or were badly made or had batteries so bloated from >>> overcharging the product couldn't be re-assembled after a visual >>> inspection. Some had all the faults combined. >>> >>> I looked at single cell AA - 5 volt chargers and again it was mixed. >>> Some were too long and batteries needed small rare earth magnets to >>> fit (true!), they were very slow at charging (no surprise) but most >>> would actually discharge the phone if left on overnight(!!!) I found >>> one that was OK but it is now out of stock. >>> >>> So I was building my own for the bug-out-bag, when I found this: >>> >>> http://www.dealextreme.com/p/2-aa-powered-cell-phone-emergency-charger-black-48432 >>> >>> >>> >>> It is only micro-usb but if that suits you this thing charges a >>> 1000maH phone cell in about 3.5 hours and is OK if left on overnight $6! >> >> Got any info on the power drain when unplugged? >> Would make a nice 5V portable power supply if it didn't run the batteries >> down when not supplying 5V power. > > on my unit > 5mA - 200+ Hrs standby with a pair of alkalines
Thanks, That renders it useless as a general purpose 5V power supply. The lithium usb rechargeable gizmo I have still works after a month.
Winston wrote:

(...)

> I am interested to know it's output voltage > measurement, David.
The reason I ask is that I want to know what prevents me from connecting three alkaline cells in series to power a cell phone that normally gets 5 V from it's USB connection. Clearly it is not the full 5 V but I wonder if that matters, considering the lower voltage of the battery in the phone? --Winston
On 27/11/2011 3:18 PM, Winston wrote:
> Winston wrote: > > (...) > >> I am interested to know it's output voltage >> measurement, David. > > The reason I ask is that I want to know what > prevents me from connecting three alkaline > cells in series to power a cell phone that > normally gets 5 V from it's USB connection. > Clearly it is not the full 5 V but I wonder > if that matters, considering the lower voltage > of the battery in the phone? > > --Winston >
I don't know. You could use 4 low self-discharge NiMH that will last 6mth+ and be close enough to 5 to count.