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

🔋3V Lithium Power

⚙️20mm x 2.5mm Precision Size

RM45

Duties & taxes included

In stock

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Description

⚡ Power your life with precision and reliability!

PRECISION FIT - 20mm diameter x 2.5mm depth ensures seamless compatibility with top small electronics.
POWER ON DEMAND - Consistent 3V lithium output fuels your devices with premium energy.
UNMATCHED LONGEVITY - Guaranteed up to 10 years of reliable storage—always ready when you need it.
TRUSTED GERMAN ENGINEERING - VARTA’s renowned quality means fewer replacements and zero leakage worries.
VERSATILE EVERYDAY ESSENTIAL - Perfect for car keys, remotes, medical devices, calculators, and more—never be powerless.

VARTA CR2025 Coin Cell Batteries deliver a steady 3V lithium power source in a compact 20mm x 2.5mm form factor. Engineered in Germany for premium quality, these batteries boast a 10-year shelf life and are trusted for use in a wide range of small electronic devices including car keys, remote controls, medical gadgets, and calculators. Pack of 5 ensures you stay powered up and ready, avoiding the frustration of unexpected battery failures.

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	9,571 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 856 in Disposable Household Batteries
Brand	VARTA
Brand Name	VARTA
Compatible Phone Models	CR2016, V23GA, V27A
Customer Reviews	4.6 out of 5 stars 21,741 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

C**N

Très bien

2.08.2026

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

J**O

Excelente

1.08.2026

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