You are correct. I rechecked--it appears that I incorrectly quoted the 20 hour rating from the 62s rather than the 25 hour rating for the HCx.
These ratings probably assume the use of battery saver mode--IMO a poor choice for serious use. And there are a number of other settings (eg backlights on all models and the compass on some models) that can affect the battery life. I have measured the current draw of my GPSes under known conditions to compare their battery lifetimes and the effects of various settings. (Of course, this requires that I have the GPS in hand to make the measurements.)
The website gives the rated weight of the 62s/62st as 9.2 oz. However, I wonder about the accuracy of that number:The vista weighs 5.5 oz, and the 60 csx is 7.5, The 62st tips in at over 9 oz.
* The 60CSx and the 76CSx are essentially the same GPS in different packages and have the essentially the same weight (7.5 vs 7.7oz). The 62s and the 78s are also essentially the same GPS in different packages and the weights differ by 1.5oz? (9.2 vs 7.7oz).
* One can also make the comparison in the other direction: the 76CSx and 78s are essentially the same case with different electronics and have the same weight. The 60CSx and 62s are essentially the same case with similarly differing electronics but the weights differ by 1.7oz?
* The manual gives a weight of 7.8 oz.
Given that the manual states 7.8oz and the predictors suggest 7.7oz, I am inclined to suspect that 9.2oz is incorrect.
I'd like to see an independent measurement. (All of the above weights include 2AA alkaline batteries.)
Doug