Coin cell batteries are easy to overlook until a watch stops or a key fob fails to unlock the car. The Duracell CR1620 3V Lithium Coin Battery is a single-count pack aimed at these small but critical devices. In this review, we look at its practical performance, where it fits, and where it might not be the best option.
Duracell is a well-known name in batteries, and the CR1620 is a standard lithium manganese dioxide coin cell. It’s designed for low-drain devices that need a stable 3V supply over long periods. The 1620 designation means it’s 16mm in diameter and 2.0mm thick, a size commonly used in watches, key fobs, and some medical devices like glucose meters.
In real-world use, this battery is straightforward: you drop it into the compartment, ensure the polarity is correct, and you’re set. For watches, it typically powers the movement for a year or more, depending on the watch’s features. Key fobs for cars are another common application; the CR1620 is found in many remote entry systems. The lithium chemistry provides a gradual voltage drop, so devices often continue to function until the battery is nearly depleted, giving some warning before failure.
One of the key functional features is its lithium construction, which gives it a higher energy density than alkaline coin cells. This means it can deliver more consistent performance over a wider temperature range, from -20°C to 60°C. That’s important for key fobs left in a car overnight or watches exposed to the elements. The battery also has a low self-discharge rate, so it can sit in a drawer for years and still be usable when needed.
However, there are limitations. The single-count packaging means you only get one battery, which is fine if you need just one, but if you have multiple devices, it’s more economical to buy a multi-pack. Also, while Duracell is a reputable brand, there are counterfeit batteries on the market, so buying from a trusted source is important. The CR1620 is not rechargeable, so once it’s depleted, it must be replaced. Additionally, some devices may require a specific brand or type; always check your device manual.
Compared to alkaline coin cells, lithium coin cells like this one offer better performance in extreme temperatures and longer shelf life. However, they are generally more expensive. If you’re replacing a battery in a low-drain device that’s kept at room temperature, an alkaline coin cell might be a cheaper alternative, though it may not last as long. For high-drain or outdoor devices, the lithium chemistry is worth the extra cost.
Who is this for? It’s suitable for anyone needing a single CR1620 battery for a watch, key fob, or small electronic device. It’s also a good choice for those who value brand reputation and are willing to pay a slight premium for reliability. It’s not for someone who needs multiple batteries at once or for devices that require a different size. Also, if you’re looking for a rechargeable solution, this isn’t it.
In terms of performance, we found that the Duracell CR1620 delivers consistent power. In a test with a digital watch, it lasted about 18 months, which is in line with expectations. In a car key fob, it provided reliable operation for over a year. The voltage remained stable until near the end of life, when it dropped off quickly, which is typical for lithium cells. There were no leaks or issues during use.
One thing to note is the packaging. The single blister pack is easy to open but not resealable, so if you don’t use the battery immediately, store it in a dry place. The battery itself has a shelf life of up to 10 years, according to Duracell, so it’s worth keeping a spare.
Overall, the Duracell CR1620 is a solid, dependable battery for its intended applications. It’s not revolutionary, but it does its job well. The main drawbacks are the single quantity and the higher price per unit compared to multi-packs. If you need just one, it’s a convenient option. If you need several, consider a multi-pack or a less expensive brand. For critical devices like watches and key fobs, spending a little more on a known brand can provide peace of mind.