blackberry chargers and moto chargers have the data pins shorted in the charger themselves. This is because they have have high speed/low speed charging detection system (as do most android phones now).
If the data pins are shorted, the charging rate is up to 1000ma, without the data pins shorted, many phones limit the charging rate to 500ma. This is to keep the phone from shorting out USB ports on computers by drawing too much power through them. The wall adapters that require separate USB cables don't always have that, or they limit the power output to about 750ma. The dozen or so smartphones in my office require about 700ma to operate, so the effective charge rate is +50ma, which takes FOREVER to charge.
I took an old 5v 1200ma wall wart from a router and cut the end off and soldered on a USB connecter (with the data pins shorted) now I can plug use those multi-plug extendable USB cables for charging any kind of phone just by putting in the right adapter tip. My P509TN will charge from dead to 100% in just over an hour.