there is no such thing on the market. AC/DC chargers must have an internal power supply which severely limit their power out put. There are many ac/dc charger than can charge at well over 12 amps but none can discharge at anything close to 10amps.

the most powerful AC/DC charger that I know of would be the skyrc d400 which has 400watts of charging power and a max of 36watts of discharge power per channel. So you can charge a 1s-4s lipo at 20amps no problem but at only 36watts of discharge power you can on discharge a 4s lipo like at 2amps and a 2s lipo at 4amps. Also 36watts of discharge power is more that most other ac/dc chargers.