In reply to G8ADD:
Brian,
Interesting power output results. The best Richard (G4ERP) and I could achieve on our 817s (about 3 year old now)was 3.2watts maximum on supplied 9.6V 1400mAh internal Ni-Mh pack,(set to maximum output) and 4.8Watts on external 12V.
There is probably quite a variation in internal setup and models.
73,
Frank