What Battery For

Batteries for health devices and watches

Hearing aid battery sizes, the batteries in glucose meters, thermometers and monitors, and watch batteries by brand.

Hearing aid battery sizesThe four hearing aid battery sizes by tab color, with each size’s IEC code and measurements from Rayovac’s datasheets. Glucose meter batteryThe battery in OneTouch, Accu-Chek and Contour blood glucose meters, and how FreeStyle Libre and Dexcom readers are powered. Thermometer batteryThe battery in Braun ThermoScan, No Touch and stick thermometers, Vicks thermometers and the Exergen TemporalScanner. Blood pressure monitor batteryThe batteries and AC adapter for Omron blood pressure monitors, and the batteries in Braun, Withings and iHealth monitors. Pulse oximeter batteryThe batteries in Masimo, Nonin, Zacurate, Innovo and Beijing Choice fingertip pulse oximeters, with each maker’s battery life and low battery sign. Watch battery sizeHow to find a watch’s battery code, the common silver oxide watch cells, and who changes it for Timex, Citizen, Seiko and Swatch. Casio watch batteryThe battery Casio’s own operation guides give for watch modules 3229, 3421, 3489, 3298 and 1271, with Casio’s battery life for each. Timex watch batteryThe battery Timex lists for each watch model number, from SR626SW and CR2016 to the solar and automatic models with none. Seiko watch batteryThe battery Seiko names for each quartz caliber in its instruction booklets, plus the solar and Kinetic calibers that need none. Swatch watch batteryThe battery in each Swatch and Flik Flak line, from Swatch’s own battery list: Original, Irony, Skin, Digital and Big Bold.

The battery at a glance

Batteries in health devices and watches, from each maker
DeviceBattery
Hearing aid, by tab coloryellow 10, brown 312, orange 13, blue 675
OneTouch Verio FlexOne CR2032
Contour Next One2 CR2032 or DL2032
FreeStyle Libre 2 readerBuilt-in rechargeable, up to 4 days
Braun ThermoScan 72 AA
Vicks V912 or V966CR1632 or CR1225, by version
Omron BP7360 and BP50004 AA
Omron BP6100, BP6350, BP43502 AAA
Pulse oximeter, by maker and model2 AAA in all seven models listed
Timex watch, by model numberCR2016, CR2025, SR626SW and others
Seiko watch, by caliberSR920SW, SR927W, SR927SW and others
Swatch watch, by line394, 377, 390 and others

From the models in each maker’s manuals and pages; other models may differ. If a coin or button battery is swallowed, call the National Battery Ingestion Hotline at 1-800-498-8666.

Where we get our information from

The figures come from the device and watch makers’ own manuals, support pages and product pages, and the hotline from the National Capital Poison Center. Checked against published data from Rayovac, Omron, Seiko Watch Corporation, National Capital Poison Center and Energizer (plus 13 more).

See all 21 sources
  • National Capital Poison Center, Button battery ingestion (poison.org/battery)
  • Rayovac (Energizer), Premium hearing aid battery datasheets, sizes 10, 13, 312 and 675 (PDF)
  • Rayovac, Hearing Aid Battery Education (with its size and tab color chart)
  • Energizer, Hearing aid batteries (sizes and tab colors)
  • power one (VARTA Microbattery), Know-How: hearing aid battery FAQ
  • OneTouch Support: Verio Flex Battery, Verio Reflect Replacing the Batteries, Ultra 2 Replacing the Batteries
  • Ascensia, CONTOUR NEXT GEN, NEXT ONE, NEXT EZ and PLUS BLUE user guides (PDF)
  • Abbott, FreeStyle Libre 2 User's Manual (US, PDF)
  • Braun Healthcare US, ThermoScan 5, 6, 7 and 7+ FAQs
  • Vicks thermometer FAQs (Helen of Troy): V966, V912, VNT200, VNT275
  • OMRON Healthcare US, blood pressure monitor product pages (BP7465, BP5465, BP7150, BP7255, BP5150, BP7360, BP5360, BP5255, BP5000, BP7900, BP7000, BP6100, BP6350, BP4350)
  • OMRON Healthcare US, AC Adapter HEM-ADPTW5 (compatible models)
  • Masimo, MightySat Rx Fingertip Pulse Oximeter operator's manual (LAB-9121C, PDF)
  • Nonin Medical, Onyx Vantage 9590 and Onyx II 9550 product pages, and TruO2 3250 on Nonin's own store
  • Timex, Instruction Manuals, User Guides and Downloads (battery and model number for each guide)
  • Seiko instruction booklets by caliber (PDFs): 2A27, 4F32, 4F56, 4T53, 4T57, 5T82, 5Y19, 5Y66, 5Y89, 6A32, 6G34, 6M15, 6M25, 6T63, 7C46, 7K52, 7T04 to 7T94, 8F35, 8T68, 8V36, DH33, H021 to H601, N830 to N877, S056 to S05A, V072, V657, W073, W861, Y182, Y187
  • Seiko, instructions for Cal. VD50 to VD59 and VR32 to VR34 (PDF)
  • Swatch Customer Care International, Battery list: Swatch and Flik Flak (PDF)
  • Einstein Associates LLC, Zacurate 500DL Finger Pulse Oximeter User Manual (Version 1.0, 2017, PDF)
  • Innovo Medical, Innovo iP900AP Finger Pulse Oximeter User Manual (Version 2.0, 2017, PDF)
  • Beijing Choice Electronic Technology Co., Ltd., Fingertip Pulse Oximeter MD300C22 operator's manual (VER1.0C22, German and English, PDF)

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Battery sizes come from battery makers' datasheets and device makers' own manuals and help pages. Check your device's manual or the old battery before you buy. If anyone may have swallowed a battery, call the National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222 straight away.