What is the battery model for the 2017 Octavia key?

[McSara]

The battery model is CR2025. It is a lithium manganese dioxide battery, named according to the IEC standard. Among them: C - indicates a chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode; R - indicates that the battery is cylindrical in shape; if it is square, F is used instead; 20 - indicates the battery diameter is 20mm; 25 - represents the battery height is 2.5mm. The nominal voltage is 3.0V, the endpoint voltage is 2.0V, and the rated capacity ranges from 140-170mAh. CR2025 typically has a lifespan of 5 years. If the manufacturer's production level is low or quality control is poor, its lifespan will be significantly shortened. Domestic first-tier brand batteries can generally guarantee this lifespan. Under ideal conditions (sealed, room temperature, no moisture, etc.), its lifespan can be further extended to 8 years or even 10 years. The usage time of a car remote key battery is closely related to the frequency of use. The more frequently it is used, the shorter its lifespan will be. If the remote key battery is dead, the mechanical key can be used directly to unlock and start the vehicle. The batteries used in car remote keys are button batteries, mainly including three types: CR2016, CR2025, and CR2032. For the specific model used in each vehicle, owners can refer to the battery model in the user manual for replacement. Button-type CR2016 battery: The usage rate of this battery in car key remotes is very high, making it one of the most common remote batteries. The battery voltage is 3V, while most car key batteries are powered by 9V, so three batteries need to be replaced each time. Examples include Honda, Toyota, Volkswagen, Mazda, etc. CR2016 specifications: battery diameter is 20mm, thickness is 1.6mm. Button-type CR2025 battery: Its usage rate is much lower than CR2016, but it is still used in some car keys. It is thicker than the 2016 model but has a relatively higher storage capacity. CR2025 specifications: battery diameter is 20mm, thickness is 2.5mm. This type of battery is also commonly used in audio remotes. Button-type CR2032 battery: The voltage is also 3V, but the capacity is around 200mAh, making it twice as thick as CR2016. The 3V-CR2032 lithium manganese battery follows a lithium-manganese dioxide structure. The positive electrode material is chemically stable manganese dioxide, the negative electrode material is lithium metal, and the electrolyte is a lithium battery electrolyte. The main components of the electrolyte are dimethoxyethane, propylene carbonate, and lithium perchlorate. Its shape resembles a button, hence the name button lithium battery or lithium manganese button battery.

[McMorgan]

I personally use a 2017 Octavia, and the key fob battery model is CR2032, which is quite common and can be easily purchased at supermarkets or online. Replacing it is simple: use a small screwdriver to gently pry open the back cover of the key, being careful not to crack the plastic shell. Remove the old battery and insert a new CR2032, ensuring the battery is placed correctly with the positive side facing up. If you notice the remote control distance shortening or the unlocking becoming less responsive, it might indicate the battery is running low—don’t wait too long to replace it to avoid inconvenience. Typically, the battery lasts one to two years, depending on how frequently you use the buttons. It’s advisable to keep a spare CR2032 in your trunk; it only costs a few dollars.

[SanMary]

I've been driving my 17 Octavia for several years and confirmed the key battery model is CR2032. This is a standard model, and replacement costs are very low. First step is to check key response - if the light doesn't illuminate when pressing buttons or remote control fails, the battery might be depleted. Just go to a hardware store to buy CR2032, pry open the back cover to replace it, ensuring clean contacts to avoid oxidation. Battery life is affected by temperature - avoid leaving it in a hot car during summer to prolong usage. Money-saving tip: Don't always go to 4S shops for replacement as they may charge premium prices. DIY replacement takes just one minute and you'll learn some handy skills.