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The charger octopus I was talking about sources power from a USB host, and has multiple connectors for devices that you want to charge.
As for the power output of other chargers, here is what you want to look for:
1) Is the PS output AC or DC.
2) Is the polarity correct (Positive or Negative on the tip)
3) Is the voltage the correct, or within range (within half a volt will never matter)
4) Is the power output correct (too little is bad, overage doesn't matter at all)
5) Is the connector the correct size
If all of these things match up, you can use any PS you find (not just for the reader, for just about any device you can find). The power output (in watts) just needs to be high enough. Any overage just isn't used. You could use a 10,000 Watt PS if everything else was correct and it would work just fine. The device will just use what it needs. Think about your lightbulbs in the house. Common wattages are around 65 watts, but the socket plugs into a line that could potentially supply 22000+ watts (depending on breakers/fuses/etc). No problem.
P
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