[aspeed]

I just use the laptop external power supply. The highest amperage you can find is the best. I have a 2 amp and a 3 amp for my two chargers. I don't use really big lipos, so it may not be for everyone. It is best if you can read the voltage before you buy them because most(my two anyway) chargers are fussy about being between certain voltages like 11 to 15 in my case. It may say 12 but be 16 or 10.3 or something. I should do like the pictures and make some nice banana plugs or something.

[nairbg]

If you are into the larger LiPo batteries, or many smaller batteries you can find higher powered DC power supplies from surplused (computer network) servers.

This Hewlett Packard unit will provide 74A at 12v ~ 900W

[ShaneM]

I just put together one of these. However, when I try to charge my 2s 2200mah LiPo at 2.2A with my Thunderpower 610C charger I get "Input power failure."

I read somewheres I was suppose to add a light bulb for resistance on the 5v black and red, so I did.

Also I doubled up the wires like the OP for minimal voltage drop but it appears that is what is happening to me.

[aspeed]

I had a few power supplies that wouldn't work like that too. They have to be exactly within the voltage that the charger uses. The low voltage cutoff is likely 11 volts or something, and the high is like 15v. Some of mine were 10.9 when a load was put on and they wouldn't work.

[ShaneM]

What was you're resolution? New/more expensive PS ?

[aspeed]

I just check them with a voltmeter before I try them. Just because they say they are 12volts doesn't mean they really are. One that I had was 16v and another was a bit less than 11v. One computer power supply I had read out 12 or so volts but didn't put out any amps.(probably why the computer didn't work and I got it for free) It worked on the chargers I have, but would quit and beep at me when it started to charge anything. You don't really need expensive power supplies, you just may have to look for a while. I always go to electronics surplus stores and garage sales and look in parts boxes and dig around. Look for 12v and at least 2 amps output, the more the better, and check with a voltmeter before you pay your money (or don't give them much just in case it isn't suitable. You can normally get a computer for free because some cities charge to dump them. Then you are only out your time and gas.