Key fobs, those indispensable gadgets for modern car owners, often rely on small batteries to function. Among these, the CR2016 battery is sometimes considered as an alternative. But is a CR2016 battery for your key fob a viable option? Let’s delve into the specifics.
Many assume that because a CR2016 battery physically fits into a key fob, it will work without issues. This assumption isn’t entirely wrong, but it’s crucial to understand the nuances. Key fobs are generally designed to operate within a voltage range, often accommodating slight variations. Smaller batteries like the CR2016, similar to those used in squeeze chain lights for their compact size, can indeed power a key fob. However, the performance might not be optimal compared to the originally intended battery type, such as the CR2032.
One significant factor is voltage sag. Smaller cells, including the CR2016, tend to exhibit a more noticeable voltage sag under load compared to larger cells like the CR2032. While key fobs are typically engineered to handle voltage fluctuations, a CR2016 battery might experience a more pronounced voltage drop. Interestingly, using two CR2016 batteries in series could potentially mitigate voltage sag compared to a single, larger cell setup. This isn’t to say single-cell designs are flawed, but in applications demanding consistent power, multiple smaller cells can sometimes offer a different voltage delivery profile.
Alt text: Side-by-side comparison of a CR2016 battery and a finger, highlighting the small size of this common key fob battery type.
Using larger lithium-ion batteries or primary cells not intended for key fobs could lead to problems, potentially damaging the remote due to excessive voltage. A CR123 battery, for example, while being a 3V disposable option with potentially longer runtime, is typically too large for most key fobs. Button cell batteries like the CR2016 are designed for low-power, intermittent use, which generally aligns with key fob operation.
For users primarily concerned with cost savings and less frequent battery replacements, a CR2016 might suffice, especially if they typically operate their key fob at close range. Most key fobs will function until the battery voltage drops considerably, possibly even as low as 1.8V to 2.3V. However, using two CR2016 batteries or a less powerful cell could result in diminished runtime compared to a single, higher-capacity battery. Furthermore, combining batteries with different charge levels, especially in series, can lead to cell damage, particularly with primary cells, and in extreme cases, battery failure.
In conclusion, while a CR2016 battery can function in a key fob designed for a different battery type, understanding the potential trade-offs in terms of voltage stability and battery life is important. For optimal and reliable performance, adhering to the manufacturer’s recommended battery type is generally advisable.
