Our current battery is 1800mA/h  and we’re considering 1C or 1/2C charge, but are concerned about thermal issues. Technically, we can do 1/4C to address the thermal issue, but the resulting charge time will be too long. What are our options?

The P9020 can deliver 1.0A @ 5V in WPC mode or 1.5A @ 5V in proprietary mode, which gives you comparable charging times compared to wall chargers. The P9020 Rx solution uses very high efficiency full bridge rectification and a buck converter, so thermal performance of our solution will be very good compared to competing solutions that use LDOs for the final DC/DC conversion.