Mine are made in China, not Germany. Are they fakes?

They are not fake. They are just made with slave labour.

how do i fit the varta 4230 to my watchman oil sensor - the one actually in the tank?

Unscrew by hand the black sensor on the top of the tank, take it back to the plug in reader inside the house, turn off plug in reader. On the sensor undo 4 screws and gentle pull apart you will see the batteries, remember the way the old batteries go in (which way up). Replace and put together. Hold sensor and the reader together and turn on, you will see a black dot on the sensor touch that against the plug-in-reader until you get a connection. screw it back on the top of your oil tank. PS if it's raining cover the hole up on the top of your oil tank whilst your refitting the batteries. Hope that helps.

how do i fit the varta 4230 to my watchman oil sensor - the one actually in the tank?

Unscrew by hand the black sensor on the top of the tank, take it back to the plug in reader inside the house, turn off plug in reader. On the sensor undo 4 screws and gentle pull apart you will see the batteries, remember the way the old batteries go in (which way up). Replace and put together. Hold sensor and the reader together and turn on, you will see a black dot on the sensor touch that against the plug-in-reader until you get a connection. screw it back on the top of your oil tank. PS if it's raining cover the hole up on the top of your oil tank whilst your refitting the batteries. Hope that helps.

could you advise use by date?

Sorry, I just installed mine, I didn't check to see if there was one. That was about a year ago in a Roberts clock radio about 2003 vintage that came from a charity shop. It keeps the digital clock going when not plugged in. Still working

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VARTA Coin Cell Batteries CR2025, Pack of 5, Power on Demand, Lithium, 3 V

VARTA Coin Cell Batteries CR2025, Pack of 5, Power on Demand, Lithium, 3 V

Product ID: 48124915

Details

Battery capacity
170
Battery cell composition
Lithium
Brand
VARTA
Number of batteries
5 Lithium
Recommended uses for product
Medical Car

⏳10-Year Shelf Life

📏20mm x 2.5mm Compact Size

🔋3V Lithium Power

75 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your life with precision and longevity!

FIVE PACK CONVENIENCE - Keep your devices powered up with a handy 5-pack, so you’re never caught off guard.
TRUSTED BRAND QUALITY - VARTA’s premium manufacturing ensures reliability and longevity, trusted by millions worldwide.
VERSATILE COMPATIBILITY - Perfect fit for car keys, remote controls, medical devices, toys, and more—your everyday power solution.
DESIGNED TO LAST A DECADE - Guaranteed 10 years of storage life means these batteries are ready whenever you need them—no compromises.
UNMATCHED POWER IN A TINY PACKAGE - 3V lithium technology delivers consistent, high-performance energy for your essential devices.

The VARTA CR2025 Lithium button cell battery offers a compact 20mm diameter and 3V output, engineered with advanced lithium manganese dioxide technology. Packaged in a convenient 5-pack, these premium batteries guarantee up to 10 years of shelf life, ensuring reliable power for a wide range of devices including medical equipment, car keys, remote controls, and more. Trusted globally for quality and performance, VARTA sets the standard in microbattery innovation.

Specifications

ASIN	B006XE8DEC
Amperage	3 Amps
Antenna Location	Medical Devices,Car Keys,Clocks,Remote Controls,Toys
Battery Capacity	170
Battery Cell Type	Lithium Manganese Dioxide
Battery Weight	0.24 Grams
Battery capacity	170
Battery cell composition	Lithium Manganese Dioxide
Best Sellers Rank	16,160 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 1,174 in Disposable Household Batteries
Brand	VARTA
Brand Name	VARTA
Compatible Phone Models	CR2016, V23GA, V27A
Customer Reviews	4.6 out of 5 stars 21,596 Reviews
Global Trade Identification Number	04008496850891
Included Components	5 x 2025 button cell
Item Dimensions	12.8 x 4.5 x 8.5 centimetres
Item Type Name	Battery
Item Weight	0.07 Ounces
Manufacturer	Varta
Model Name	Electronique Lithium
Model Number	CR2025
Number of Batteries	5 Lithium Metal batteries required. (included)
Number of batteries	5 Lithium Metal batteries required. (included)
Recommended uses for product	Medical Devices,Car Keys,Clocks,Remote Controls,Toys
Reusability	Einmalgebrauch
Unit Count	5 count
Unit count	5 count
Voltage	3 Volts

Reviews

G**S

Watch batteries

Great value for money

16.07.2026

R**K

Reliable German Batteries

Love these. More expensive than cheap Chinese products, but the fact that they are made in Germany means they are my battery brand of choice. For applications where I am looking for long life and reduced risk of leakage I always try to buy Varta or Duracell or Energized.

5.01.2022

C**L

Missing battery from pack

Came quickly but had 1 battery missing from the pack

18.09.2025

A**R

Billy

Good

24.02.2026

J**T

Work

Work fine

17.02.2026

S**S

Good price but...

Only 4 cells received. The loose one measured less than 3V. The other 3 were all over 3V. Date on packaging 03-2032.

2.05.2026

D**N

Super

Arrived on time and well packaged. Great batteries.

9.01.2025

S**Y

Batteries

First class

16.12.2025

T**.

Prima product

Goed geprijsd en snel geleverd

16.06.2026

K**K

Super

21.06.2024

S**E

Piles

Tout est ok.

12.05.2026

U**A

Batteria affidabile e di qualità

Batteria affidabile e con prestazioni costanti. Perfetta per telecomandi, piccoli dispositivi elettronici e apparecchi che richiedono questo formato. La qualità VARTA si nota nella durata e nella stabilità della carica. Prodotto semplice ma sempre una garanzia.

7.07.2026

T**X

Gutes Preis / Leistungsverhältnis

Halten recht lange

10.06.2026

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