question about ppc's

[lec666]

i had an 801 battery die on me the other day and i decided to make a
passthrough out of it. while picking up the switch at radioshack i found
a ppc w/a usb output spec of 5VDC 750mA.

the passthrough i made is just brutal when plugged into a usb port on my pc.
if i use the ppc,the performance is much less but still better than a standard
801 battery.

can anyone shed some light as to why this may be as i though usb ports
can only supply 500mA?

 

[Vapinginjapan]

It might be that when you plug it directly into the USB port, it's able to draw power from the port and the battery at the same time.

It woudl seem that general wisdom on the board says that 1000mA is the desired current for battery powered passthroughs.