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hippy
@Greenbank
Forerunner 225 Battery life: Up to 4 weeks in watch mode; up to 10 hours in training mode
Forerunner 220: "Up to 6 weeks in watch mode; up to 10 hours in training mode "
Probably slight improvements to battery between the 220 and 225 to make up for the optical HR measuring magic.
As for 24 hours:-
920XT: "Up to 24 hours in normal GPS mode; up to 40 hours in UltraTrac mode"