Read another thread here that describes the IC and charging software. There are even 2 patches that has not been modified for new batteries.

Dr-Frosk-dk use separate chargers and test the batteries with special hardware and software. When the N900 was released, the capacity for the rechargeble AA batteries were 1200mA. I recently bought rechargeable AA batteries with 2700mA. Read Dr-Frosk-dk properly, and not just what you want to read.

If you disregard the price, and willing to pay the 10A battery for the N900 is fully possible, so be very careful with claims,