Key fobs are indispensable for modern vehicle owners, offering convenient remote access and security features. These devices rely on small batteries to function, and the CR2016 battery is a common power source. While seemingly unremarkable, the choice of battery, specifically the CR2016, impacts your key fob’s performance and longevity. Let’s delve into the specifics of the CR2016 key fob battery and what you need to know to keep your remote working optimally.
Voltage Sag and CR2016 Batteries in Key Fobs
One characteristic of small batteries like the CR2016 is voltage sag, a temporary drop in voltage under load. This phenomenon is important in key fobs because they require a consistent voltage to operate reliably. While CR2016 batteries experience voltage sag, it’s generally less pronounced than in older battery chemistries like alkaline or NiMH. Smaller cells, such as the CR2016, might exhibit slightly more voltage sag compared to larger counterparts like the CR2032.
For most key fob designs, manufacturers account for this voltage range. They are typically engineered to function within a broad voltage spectrum, often from 2V to 6V. This tolerance ensures that even with voltage sag under load, the key fob will continue to operate without issue under normal conditions. In fact, using two CR2016 batteries in series might even result in less voltage “droop” than a single, larger cell in certain scenarios, although single-cell setups are still widely effective.
Alternatives and Considerations Beyond CR2016
While CR2016 batteries are adequate for many key fobs, exploring alternatives can highlight potential benefits or drawbacks. Using larger lithium-ion batteries or primary cells, for instance, could lead to significantly different outcomes. These more powerful batteries might exceed the voltage tolerance of the key fob circuitry, potentially causing malfunction or damage due to excessive power.
A single CR123A battery, although physically larger, could be a viable alternative in some cases if the key fob design accommodates it. A CR123A offers a 3V output, similar to two CR2016 batteries in series, but with a significantly higher capacity. This translates to potentially extraordinary runtime and possibly even improved remote range due to the increased amperage and capacity compared to button cells like the CR2016. Button cells, while compact, are relatively underpowered.
Practical Implications for Key Fob Users
For everyday use, the CR2016 battery typically performs adequately. Most key fobs will function until the battery voltage drops to around 2.3V or even as low as 1.8-2V. However, users might observe diminished range as the battery voltage decreases. Using two CR2016 cells might lead to shorter overall runtime compared to a single, more robust cell. Furthermore, if using multiple cells, it’s crucial to ensure they have similar charge states. Using cells with differing charge levels can lead to cell damage, particularly with primary cells, and in extreme cases, battery failure.
Ultimately, understanding the nuances of key fob batteries like the CR2016 helps car owners make informed decisions about battery replacement and troubleshoot potential remote issues. While the CR2016 is a standard choice, considering factors like voltage sag and exploring alternatives can optimize your key fob’s performance and reliability.
