Yeah I have the paper manual in front of me. It says 500maA input. Charging time 1.5 hours. Play time upto 20hr. I'd say that is fair. To me that is amazing. Probably due to the fact a bigger battery can be charged faster.
I have used my Life now for some hours so I reckon it is nowhere near as high as say 80% charged probably in the 30%-60% charged area and I plugged in to 2A output with a USB meter and it is not 500mA, it is actually 290mA.
Same with 2 different chargers, 2 different cables so that is actual limit. Possibly I'm not as low as 60% which might be it eat slower. I'd have to use the Life til flat then try again. There is no battery level indicator. I can only guess from how many hours I used since last charge, if 20h = 100% so 10h = 50% I assume and trickle doesnt usually kick til about 85% so I'm say 80% confident it is an actual 290mA max input.