I am above all a lover of mechanical watches — but I am not sectarian: I also have my small collection of quartz watches. And when it comes to changing the battery, it's best to know what you're doing. Here is a practical guide to understanding the types of batteries, their equivalences, the recommended brands and above all, maximizing the lifespan of your quartz watches.

Why choose the right watch battery

Quartz watches use small, often overlooked but crucial button batteries. Choosing the wrong battery (wrong chemistry, wrong voltage, obscure brand) can lead to malfunctions, shortened lifespan, or even leaks that irreparably damage the movement.

The key: identify the right type of battery and choose a trusted brand.

Watch battery types: alkaline, silver oxide, lithium

• Alkaline (1.5V) : common format (AG13, LR44, etc.), low cost, but decreasing voltage and average lifespan.
• Silver oxide (1.55V) : more stable voltage, longer lifespan, ideal for quality or sensitive watches.
• Lithium (3V) : used in high consumption or multifunction watches (chronos, alarms, etc.).

How long does a watch battery last?

• Alkaline : 1 to 2 years in standard use.
• Silver Oxide : up to 3 years with stable voltage.
• Lithium : 5 to 10 years depending on the functions activated.

Store your new batteries at room temperature and change them as soon as a watch stops, to avoid any leaks.

Battery brands used by watchmakers

• Renata : the Swiss standard, used in professional watchmaking.
• Varta : reliable German brand, widely used in workshops.
• Maxell, Energizer, GP : recognized brands, reliable if purchased from reputable sellers.

Table of watch battery equivalences

Practical tips for changing your battery

• Use a suitable tool to open the bottom without damaging it.
• Clearly identify the battery to be replaced before purchasing.
• Do not touch the internal contacts with your fingers (risk of oxidation).
• Replace the caseback securely (clip or screw) and check the water resistance if the watch was waterproof.
• Mandatory recycling of used batteries at a recycling center or collection point.

My personal opinion

I'm not going to lie to you: I prefer mechanical watches. But in my quartz collection, I saw the difference between a low-end battery bought in a hurry and a good Renata.

And frankly, a stack of €2 more is not a lot to drink to avoid shooting a movement...

FAQ – Frequently Asked Questions About Watch Batteries

Can we replace an AG13 with an LR44?

Yes, they are equivalent in size and voltage (1.5 V). However, it is recommended to choose a silver oxide version (e.g. SR44 or 357) for better stability and extended battery life.

What is the best watch battery brand?

Renata (Swiss manufacturing) is widely recognized for its reliability. Varta, Maxell, Energizer and GP are also good brands if they come from reputable dealers.

Can a watch battery leak?

Yes, especially if it is alkaline and of poor quality. A used battery left in a watch for too long can leak and damage the movement. Silver oxide batteries present fewer risks.

How long does a watch battery last?

An alkaline battery lasts on average 1 to 2 years. A silver oxide battery can last up to 3 years. Lithium batteries (3V) can last more than 5 to 10 years depending on the use of the watch.

Should I have the battery changed by a watchmaker?

This is not obligatory, but it is recommended if the watch is waterproof, valuable, or if you do not have the appropriate tools. The watchmaker can also check the condition of the seal and the watertightness after replacement.

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