Maxell Lithium button cell CR2016 - Reliable energy in a compact form

The Maxell CR2016 is a high-quality and extremely reliable 3-volt lithium button cell that is used in countless small electronic devices worldwide. The Japanese manufacturer Maxell is one of the pioneers in battery technology and stands for the highest manufacturing quality and leak-proof designs.

Despite its extremely flat design of just 1.6 millimetres, this button cell delivers a constant voltage level and sufficient capacity to reliably supply car keys, sensors and watches with power for years to come. Thanks to the advanced lithium manganese dioxide chemistry, the cell also benefits from extremely low self-discharge, making it ideal for long-term storage.

Highlights at a glance

• Constant voltage: Provides reliable 3 volts over a long period of time for the fault-free operation of your sensitive small devices.
• Long shelf life: Thanks to their extremely low self-discharge, these lithium cells can be stored for up to 10 years without any significant loss of capacity.
• Leak-proof: The high-quality workmanship of Maxell prevents leakage and thus protects your valuable electronics from corrosion damage.
• Temperature stable: Works reliably under extreme conditions in a wide temperature range from -20 °C to +85 °C.
• Mercury-free: Environmentally friendly technology without the addition of toxic heavy metals such as mercury (0% Hg).

Areas of application

The flat CR2016 is the classic energy source for compact housings:

• Car keys & remote controls: The absolute standard for many modern radio keys, garage door openers and parking heaters.
• Smart home & sensors: Ideal for small door and window contacts, compact thermometers or weather stations.
• Watches & calculators: Long-lasting power source for digital wristwatches, desktop calculators, organisers and fitness trackers.
• Medical technology: Reliable power supply for blood glucose meters, digital clinical thermometers and heart rate monitors.

Assembly & safety instructions

• Keep away from children: Button cells can cause life-threatening internal injuries and chemical burns if swallowed. Always keep batteries out of the reach of children and consult a doctor immediately if you suspect that they have been swallowed!
• Note polarity: The flat side, usually labelled with the type designation, is the positive pole (+), the slightly curved underside is the negative pole (-).
• Avoid fingerprints: When inserting button cells, ideally only handle them by the edge or with plastic tweezers. A greasy film from your fingers on the contact surfaces can impede the flow of current and lead to failures.
• Not rechargeable: Never attempt to charge this primary lithium battery in a charger. This can lead to overheating, leakage or, in the worst case, explosion.

Features

FAQs about the Maxell CR2016

Can I use a CR2032 instead of the CR2016?

No, usually not. Although both cells deliver 3 volts and measure 20 mm in diameter, at 3.2 mm the CR2032 is exactly twice as thick as the flat CR2016 (1.6 mm). It usually does not fit mechanically into the battery compartment or prevents the housing cover from closing. However, there are exceptions with certain devices (e.g. some car keys) where two superimposed CR2016 can be replaced by one CR2032 – in this case, always refer to the operating instructions!

What do the numbers "2016" mean?

This is an internationally standardised size specification: The first two digits ("20") stand for the diameter in millimetres (20.0 mm). The last two digits ("16") represent the height of the battery in tenths of a millimetre (1.6 mm).

How can I tell if the battery in my key is running low?

With car keys, the range of the remote control often decreases noticeably at first, or the small indicator LED on the key flashes much more weakly than usual. When measuring with a multimeter, an unused, new cell should display slightly above 3.0 volts (approx. 3.2V - 3.3V). If the voltage drops below approx. 2.7 volts under load, it is recognised as empty by many devices.