See also charging auto and deep-cycle batteries|
Mobil Phone Charging:
Philipson says: Nokia told me that most phones sold in the past few years will work with the ACP8A and ACP12A 5.7-volt chargers.
"Unauthorized Charger" Message on Razr:
The USB specification limits the minimum power available from the interface voltage pins to 500 mA at 5 volts, or 2.5 W. The GSM version of the RAZR, which first adopted the USB charger cable, can apparently live with that, but the CDMA phone is more power hungry and needs more than 2.5W to charge. The chargers supplied by Motorola will deliver significantly more than 500 mA, and as a practical matter a lot of other USB chargers and interfaces will too, but with the latter you can't count on them to support more than the standard requires.
It may or may not still charge the phone, you'll have
to try it to see. If it does charge the phone it will take longer to
do so than a higher power charger would.
Another person said "I'm not sure that's all there is. My wife has a V3c, and I tried a Zip-Linq USB power supply rated 5V @ 1000 mA and got the same error message."
Had similar experiences with another phone and just kept exchanging them at Wal-Mart until one worked.
Mobil Phones - radios Motorola V330 5.9V 375 mA Motorola RAZR V3c 5 V 500 mA Plantronics Headphone 5 V 180 mA Kenwood HandiTalkie 13.8 V 650 mA Laptops Apple PowerBook G4 24 V 1.9 A Toshiba Portoge 15 V 2 A Other Computer: Card Reader HD 5 V 800 mA LaCie Firewire 12 V Canon PIXMA iP90 printer 16 V 1.8 A Firewire 7-30 V Other: Canon ZR90 digital camcorder 8.4 V 1.5 A Magellan eXplorist 500 GPS 5 V 1 A Sony CD MP3 player 4.5 V 500 mASee Also Power requirements in Home & Garden
charging auto and deep-cycle batteries
Batteries in Home & Garden.
Charging at Deep Cycle FAQ
Charging the lead-acid battery - Battery University
12 V power for ham radio
The charge of the mobile phone brigade by Graeme Philipson
Hand Crank flashlights and Mobil Phone Chargers
Uninterruptible power supply
CTEK Multi US 3300 12V Smart Battery Charger Review
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