Voltage isn't really an issue. Easy enough to wire parallel,
throw a resistor into the mix to drop the voltage to the 2.5vdc
they need. ( according to the spec sheet 5vdc max )

However, the LED's draw 20ma of current EACH. If you were to
light all 450 LED's, you're talking 9000ma or 9 amps.

It exceeds what you can power via USB alone.

The original design of 588 LED's would have had a total amp draw
of 11760ma ( 11.76 amps ) with all LED's lit.

You'll have to use an external power supply to provide the power.

To stay within the 6 amp limit with the PlusPower thing you're
talking about ( I assume it's an external power supply ) you
would be limited to 300 lit LED's at any given time.

-Daye