The fastest places to buy key fob batteries

You can buy key fob batteries at drugstores, big-box retailers, auto parts shops, and online sellers. The fastest option depends on whether you need the battery today or can wait for shipping. Drugstores like CVS and Walgreens stock common sizes (CR2032, CR2025, CR2016) in their pharmacy or electronics aisles and let you walk out in minutes. Auto parts chains like AutoZone, O'Reilly, and Advance Auto Parts carry a wider range of fob-specific batteries and often have them in stock same-day. Walmart and Target stock batteries in their electronics sections, though selection varies by location.

Online retailers like Amazon ship batteries within one to three days with Prime, and specialty battery sites like Battery Plus Bulbs and Batteries.com often have faster shipping than general retailers. If you need a battery in the next hour, a nearby drugstore or auto parts shop is your only option. If you can wait overnight or two days, online usually costs less and gives you more choices.

Key Takeaways

  • CVS, Walgreens, and Walmart carry common key fob battery sizes in their electronics aisles and let you buy and leave the same day.
  • Auto parts shops like AutoZone and O'Reilly stock a wider selection of fob batteries and can tell you the exact size your car needs if you bring the fob in.
  • Online retailers ship within one to three days and usually cost less per battery than drugstores, especially if you buy in bulk.
  • The battery size you need depends on your car brand and fob model, so check your owner's manual or the fob itself before you shop.

Drugstores and big-box retailers

CVS, Walgreens, Rite Aid, Walmart, and Target all stock key fob batteries in their pharmacy or electronics sections. These stores carry the most common sizes: CR2032, CR2025, and CR2016. A single battery costs between $3 and $8 depending on the brand and store. The advantage is speed — you can walk in, find the battery, and leave within 10 minutes. The disadvantage is price: you pay more per battery than you would online, and the selection is limited to the most common sizes.

If your fob uses an uncommon size or a specialty battery, a drugstore may not have it in stock. Call ahead or check the store's website to see if they have your specific size before you go. Some stores let you order online and pick up the same day, which saves you a trip if they don't have it on the shelf.

Auto parts shops

AutoZone, O'Reilly Auto Parts, Advance Auto Parts, and NAPA all stock key fob batteries and usually have a larger selection than drugstores. These shops carry CR2032, CR2025, CR2016, and less common sizes like CR2450 and 2032A. A single battery costs $2 to $6, which is cheaper than drugstores. Many auto parts shops will test your fob for free to confirm the battery is the problem before you buy, and staff can usually tell you the exact size your car needs if you bring the fob in.

Auto parts shops are open early and late on weekdays and weekends, making them convenient if you need a battery outside normal drugstore hours. Some locations offer bulk discounts if you buy multiple batteries at once. Check their website or call to confirm they have your size in stock before you drive over.

Online retailers and specialty battery sites

Amazon, Battery Plus Bulbs, Batteries.com, and other online battery retailers ship key fob batteries within one to three days. Prices range from $1 to $4 per battery, and you can buy in bulk at a discount — a pack of five CR2032 batteries might cost $5 to $8 total, or about $1 to $1.60 each. Online retailers stock every common size and many uncommon ones, so if your fob uses a rare battery, online is often your only option.

The trade-off is time. If you need the battery today, online won't work. If you can wait one to three days, online is usually cheaper and gives you more choices. Some online retailers offer free shipping on orders over a certain amount, so buying multiple batteries or other items at once can save money. Read the product description carefully to confirm the battery is the right size for your fob before you order.

Finding the right battery size for your fob

Key fob batteries come in different sizes, and using the wrong size can damage your fob or cause it to work poorly. The most common sizes are CR2032 (used in many Honda, Toyota, and Ford fobs), CR2025, and CR2016. Some fobs use larger batteries like CR2450 or specialty sizes like 2032A. The easiest way to find your size is to open your fob and look at the battery itself — the size is printed on the top. If the battery is dead and you can't read it, check your car's owner's manual or search online for "[your car brand and year] key fob battery size."

If you're not sure how to open your fob, most auto parts shops will open it for free and tell you the size. Some fobs use a small flathead screwdriver to pry open the case; others have a sliding button or a screw on the back. Once you know the size, you can shop with confidence at any retailer.

Comparing price and convenience

A single battery from a drugstore costs $4 to $8. The same battery from an auto parts shop costs $2 to $6. Online, a single battery costs $1 to $4, but you may have to buy a pack of two or more. If you need the battery today, a drugstore or auto parts shop is your only choice, and the extra cost is worth the convenience. If you can wait one to three days, online is cheaper, especially if you buy a pack of five or ten batteries to keep on hand.

Some people buy a single battery from a drugstore or auto parts shop for when ready use, then order a bulk pack online for future replacements. This way you're not stuck without a working fob while you wait for shipping. If you have multiple cars or family members with fobs, buying a bulk pack online makes sense because you'll use the extra batteries eventually.

What to do if your store doesn't have the battery in stock

If a store doesn't have your battery size, you have three options: order online for delivery in one to three days, visit a different store, or ask the store to order it for you. Many drugstores and auto parts shops can order batteries from their warehouse and have them ready for pickup the next day. Call ahead and ask if they offer this service and how much it costs — some stores charge a small fee, others don't.

If you're in a hurry, visiting a second store is often faster than waiting for an order. Use Google Maps or the store's website to find nearby locations and call ahead to confirm they have your size. If you have time, ordering online is usually the cheapest option and gives you the most selection.

Frequently Asked Questions

Can I use any CR2032 battery in my key fob?

Yes, any CR2032 battery will work in a fob designed for CR2032, regardless of brand. Duracell, Energizer, Amazon Basics, and store brands are all the same size and voltage. The main difference is how long they last — name brands like Duracell and Energizer typically last longer than generic brands, but all will work when ready.

How long does a key fob battery last?

Most key fob batteries last three to four years with normal use. If you use your fob frequently, the battery may last two to three years. If you use it rarely, it may last four to five years. Batteries lose power over time even if you don't use them, so an old battery may be dead even if your fob has been sitting in a drawer.

Is it cheaper to replace the battery myself or have a dealer do it?

Replacing the battery yourself costs $1 to $8 depending on where you buy it. Having a car dealer replace it costs $50 to $100 in labor plus the battery cost. If you can open your fob with a flathead screwdriver, replacing it yourself takes two minutes and saves you $50 to $100. Most fobs are straightforward to open — check your owner's manual or search online for instructions for your specific model.

What if I buy the wrong battery size?

If you buy the wrong size, it won't fit in your fob or won't make proper contact with the terminals. The fob won't work, and you may damage the contacts if you force it in. Check the size printed on your old battery or in your owner's manual before you buy. If you're unsure, take your fob to an auto parts shop and ask staff to confirm the size.

Do I need to reprogram my fob after changing the battery?

No, changing the battery does not erase your fob's programming. Once you install the new battery, your fob will work when ready without any reprogramming. If your fob still doesn't work after you install a new battery, the problem may be the fob itself, not the battery — contact your car dealer for repair options.