For example, Miyota’s battery life claims are based on using the chronograph function for 60 minutes or less per day. What we do know is that running the chronograph means the watch is working harder and this reduces the battery life. Please share your experience in the comments below… That is not to say 8 times shorter, but we need more information to confirm the expected battery life from the 8136.

Battery Life:Īccording to Miyota, the correct SR927W battery cell should last about 4 years in the caliber 6S20, but the Ultra High Frequency movements seem to have shorter battery life than standard quartz watches. Please share your experience in the comments below. Ultra High Frequency Technology:īulova claims their Ultra High Frequency movements are accurate to about +/-5 seconds per month. This would mean that it is using Bulova’s 3 prong quartz crystal that vibrates 8 times more than a standard quartz crystal (32.76 * 8 = 262).īulova and Miyota are both owned by Citizen. The major difference is that the Miyota 6S20 runs with a frequency of 32,768Hz, and the Bulova is cranked up to an Ultra High Frequency (UHF) of 262 kHz as it is advertised on the dial of watches with the 8136 (similar to the P102).

Bulova watch battery guide