The Miyota caliber 2115 is a 0 jewel quartz movement. There is also a caliber 2105 which adds a day of the week complication.
Miyota states the accuracy of this movement to be +/-20 seconds/month.
The caliber 2115/2105 takes an SR626SW watch battery. The battery is said to last up to 3 years. There is a battery saving (aka hacking) mode by pulling out the stem into time setting mode (position II).
At the time of this post the replacement price is around $10.95.