What kind of battery do I need for my watch?

Please check out the chart below to identify the correct battery for your reference:

MOVEMENT	POWER SUPPLY	ADDITIONAL FUNCTIONS	JEWELS	POWER RESERVE¹	REGULATION	MIDDLE RATE¹
ETA 2893-2	Automatic winding Manual winding	GMT Date²	21	42h	Top	±4s/day
Ronda 515.24D	Quartz 371 (SR920SW) battery	GMT window Date²	1	≈45 months	-	-10 ~ +20s/month
Seiko NH34A	Automatic winding Manual winding	GMT Date²	24	More than 41h	-	-20 ~ +40s/day
Seiko NH35A	Automatic winding Manual winding	Date²	24	More than 41h	-	-20 ~ +40s/day
Seiko VH31A	Quartz 371 (SR920SW) battery	-	2	≈2 years	-	±15s/month
Seiko VK64A	Meca-Quartz 394 (SR936SW) battery	Chrono Chrono minutes 24h indicator	0	≈3 years	-	±20s/month
Sellita SW200-1 a	Automatic winding Manual winding	Date²	26	Minmum 38h Typical 41h	Standard	±12s/day
Sellita SW200-1 b	Automatic winding Manual winding	-	26	Minmum 38h Typical 41h	Standard	±12s/day
Sellita SW330-2	Automatic winding Manual winding	GMT Date²	25	Minmum 50h Typical 56h	Elaboré	±5 s/day
Sellita SW510 BH b	Automatic winding Manual winding	Chrono Date²	27	Minimum 56h Typical 62h	Elaboré	±5s/day
¹Please note that the data here reported refer to a watch in correct and ideal conditions of usage. Therefore, power reserve and middle rate accuracy may vary according to various external factors, such as temperature, humidity, watch head orientation during daily use and rest, vibrations, impacts, and, regarding time keeping, current power reserve itself. ²Not present in some cases.