🏷️ Best Budget
Reviewed by Marcus Knapman, BSc (Hons) Computing ·
Researched from 100+ Amazon customer reviews
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Nobody gets excited about a coin battery. You only think about one when your car key fob goes dead in a rainy supermarket car park, or when the bathroom scales flash an error at you and you're forced to confront the fact that you haven't a clue what size is inside. It's a grudge purchase if ever there was one, so the question is simple: which one do you buy, and does the brand on the blister pack matter?
I've spent time with the spec sheet for the Duracell 2450 Lithium Coin Batteries (2 Pack), and the short version is this. At £4.95 for two cells, they're not the cheapest CR2450s you can find, but they come from a name that has been making batteries since before most of us were born, and the pack has a few features that I think are worth paying a small premium for. The 10 year storage life in particular makes them ideal for keeping a spare in a drawer.
There's no Amazon star rating available for me to quote at the time of writing, so I'm leaning on the manufacturer's claims, the spec sheet and what the packaging tells us. I'll be upfront about where that leaves some unanswered questions, because pretending otherwise would be daft.
Most people buy a coin battery for one specific job, use one cell, and then shove the spare in a drawer. That's where the 10 year storage guarantee earns its place on the list of features. A two pack that you can forget about until the next dead key fob, scale or thermometer is exactly what this format needs to be. Cheaper alkaline button cells can lose charge sat in a drawer, and lithium chemistry is the reason these don't.
The pack also mentions high-purity lithium, which is Duracell's way of saying the cells should deliver steady 3V output across their life rather than fading gradually. For devices like key fobs and temperature sensors that sip power for months or years, a flat discharge curve is more useful than raw capacity numbers on the back of the pack.
This is the part I'd put at the top of the list for anyone with small children in the house. Coin batteries are genuinely dangerous if swallowed, and the packaging here is a double blister that is difficult to open without scissors. Duracell has also developed it in partnership with the European Association of Paediatrics, which carries more weight with me than a generic 'child safe' sticker.
The flip side is obvious. If you're stood in the hallway with a dead remote and a mild sense of urgency, you will be hunting for the scissors. That's the point, and I'd rather it were irritating than easy. Once the cell is out, though, make sure the old one goes in the bin or a battery recycling point straight away, and not on the arm of the sofa.
The CR2450 is one of the chunkier coin cells, noticeably bigger than the familiar CR2032. That size matters: if your device needs a 2450, a 2032 will not fit, however tempting it might look in the drawer. Duracell lists key fobs, small home devices, scales and temperature sensors as the main uses, and that matches where this cell tends to turn up. Some car remotes, digital bathroom scales and wireless weather station sensors are typical candidates, though you'll need to check your specific device's manual or the old battery itself.
Always check the code stamped on the cell you're replacing. The number 2450 on the pack and the number on your old battery should match exactly. It sounds obvious, but a surprising number of returns on battery listings come from people who grabbed the wrong size.
£4.95 for two works out at roughly £2.48 a cell. You can find unbranded multipacks for noticeably less, and for a device that hardly matters, like a spare kitchen scale, that might be fine. For anything where a flat battery causes real inconvenience, such as a car key, I'd pay the small premium for a name I recognise and a guaranteed shelf life. The saving on a no-name cell is a matter of pennies, while a failed cell in the wrong moment costs you far more in time and irritation.
Two cells in a pack is also a sensible quantity. It's enough to replace one now and have a spare waiting, without tying up money in a bulk pack of ten that you'll never use.
With no Amazon rating to lean on, I can't point to thousands of buyers confirming real-world lifespan, so I'm relying on the manufacturer's claims and the lithium chemistry itself, which is well proven. Claims are claims, and I'd always treat the 10 year figure as a storage guarantee rather than a promise of how long the cell will last once it's powering your device. Battery life in use depends heavily on how hungry the device is.
The other niggle is price. Two cells for £4.95 isn't a bargain by any stretch if you have several devices needing the same size. In that situation a larger multipack elsewhere would work out cheaper per cell, even if you lose the child-resistant packaging.
If you want one replacement cell and one spare to sit in a drawer for years, these suit you well. If you have small children or grandchildren visiting, the packaging alone is a reason to choose these over a loose, poorly packed alternative. If you're stocking up for a dozen sensors around the house, shop around for a bulk deal instead.
A dependable, sensibly packaged CR2450 two pack that suits anyone wanting a trusted brand and a spare that'll keep for years. If you're replacing a car key battery or have little ones about, I'd pay the small premium. If you need a stack of cells for lots of gadgets, a bulk pack from elsewhere will save you money.
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