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 Batteries Electronics CR2450 Lithium button cell battery 2-pack, Button cells in original blister pack of 2

VARTA Batteries Electronics CR2450 Lithium button cell battery 2-pack, Button cells in original blister pack of 2

Product ID: 48124566

Details

Battery capacity
560 Milliamp
Battery cell composition
Lithium
Brand
VARTA
Number of batteries
1 Lithium Ion
Recommended uses for product
Car Keys Toys

⏳10-year shelf life

⚡560mAh capacity

🔋3V stable power

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RM80

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Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power your essentials with VARTA’s long-lasting lithium precision!

UNMATCHED LONGEVITY - Up to 10 years guaranteed storage—power when you need it most
CONSISTENT 3 V OUTPUT - Reliable voltage ensures flawless device performance every time
ECO CONSCIOUS SAFE - Mercury-free and EU-compliant for guilt-free power solutions
ULTRA COMPACT DESIGN - 24mm diameter x 5mm depth fits seamlessly in your essential gadgets
TRUSTED BRAND QUALITY - VARTA’s premium lithium tech means no compromises on reliability

The VARTA CR2450 lithium button cell battery 2-pack delivers a steady 3V output with a compact 24mm x 5mm form factor, perfect for powering a wide range of small electronics from car keys to medical devices. Featuring premium lithium manganese dioxide chemistry, these batteries offer a robust 560mAh capacity and an impressive 10-year shelf life, ensuring your devices stay reliably powered. Packaged securely and mercury-free, VARTA guarantees trusted brand quality and eco-conscious performance for professionals who demand dependable energy solutions.

Specifications

ASIN	B007FD64YQ
Amperage	3 Amps
Antenna Location	Car Keys,Clocks,Medical Devices,Remote Controls,Toys
Battery Capacity	560 Milliamp Hours
Battery Cell Type	Lithium Manganese Dioxide
Battery Weight	0.2 Grams
Best Sellers Rank	879 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 140 in Fire Safety 163 in Disposable Household Batteries
Box Contents	Battery pack
Brand Name	VARTA
Compatible Phone Models	Not for Mobiles
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (19,136)
EU Spare Part Availability Duration	2 Years
Global Trade Identification Number	04008496747238
Item Dimensions	10 x 5 x 15 centimetres
Item Type Name	Battery
Item Weight	6 Grams
Manufacturer	VARTA
Model Name	VARTA LITHIUM Coin CR2450 Blister 2
Model Number	6450101402
Number of Batteries	1 Lithium Ion batteries required. (included)
Reusability	Single Use
Unit Count	2 count
Voltage	3 Volts

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