Bike Forums - View Single Post - Rechargeable boost battery pack?

01-03-12 | 08:51 AM

#10

bud16415

Senior Member

Joined: Jul 2011

Posts: 1,141

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From: Erie Penna.

Here is what I built. My thought was to provide a 12V supply and then let a car charger adapter do the job of voltage and current control and monitoring to the phone. It worked pretty good but not quite ready for prime time yet. Most cars have a steady 12V minimum and when running are around 14V. The car adapters are mostly designed around 12 to 25V being supplied to them. Even though the output voltage is much lower USB charging voltage. It seems that my iPhone 4 is a smarter phone than my 3G was and when the pack voltage drops to about 9V the phone also turns the charge off. I had great success with using this on my 3G getting many, many days of 24-7 up time from a set of AA’s.

I have plans of doing a little more experimenting with a higher voltage supply and also several different car adapters for the iPhone. Right now I’m using it with one of the tiny USB to car lighter sockets and its working good. YMMV

First setup.

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