The best 18650 batteries in 2022
Get more power or a longer-lasting charge with the top 18650 batteries for torches, doorbell cams, vaping and more
You won’t find 18650 batteries in your local supermarket or even many mainstream online stores, yet they’ve become the battery of choice for a new wave of devices and electronics – and for good reason, too. The best 18650 batteries can enhance high-performance LED torches and headlamps, allowing LEDs to shine brighter for longer than an ordinary set of AAs or AAAs, and you’ll also find them in outdoor wireless cameras, doorbell cameras, smartphone or camera gimbals, handheld fans and drones, where their ability to deliver long-lasting power can make all the difference.
They’re also heavily associated with vaping or e-cigarettes, both because they need replacing from time to time, and because there’s a surge of interest in vaping mods, which allow vapers to customise their vape experience. These mods often need a higher-powered battery to function, and a rechargeable Lithium Ion 18650 fits the bill nicely.
How to choose the best 18650 batteries
Where can I buy 18650 batteries?
Many of the largest manufacturers don’t sell direct to the public; they sell them to be integrated into other devices, such as a torch, a vape kit or e-cigarette. You can still buy 18650 batteries from specialist suppliers or component stores, though, and Amazon carries products by some brands.
What kind of 18650 batteries should I buy?
Good question. Don’t be tempted to just rush out and buy the cheapest you can find; 18650 batteries aren’t like AA batteries, even if they can look similar. Admittedly, they do all stick to the same 3.6v to 3.7v voltage range, and resemble a super-sized AA, but they differ quite a bit in terms of their capacity and discharge rate and come in two different designs to boot.
Vape kits and e-cigarettes tend to use the flat-topped design, with flat contacts at either end of the battery and no built-in overcharge or overheat protection. Torches and other electronic devices use a button-topped design, with a top contact like the one you’d find on an AA or AAA battery. These are more likely to include a protection circuit that prevents the battery from overheating, overcharging, short circuiting and more besides. They also include a system of vents to prevent high pressure building up within the cell.
There’s always a risk in using an unprotected battery in a device designed around a different battery, so you need to know what you’re doing and make sure the specs match up. Meanwhile, some devices will only take a longer, protected, button-top battery. If you have the option, pay extra for protection – it will give you peace of mind when using and charging your battery or device, if nothing else.
What specs should I look out for?
When comparing 18650 batteries, the key specs are the continuous discharge rating (CDR), while the pulse or burst discharge rating is the current, in amps, that you can continuously draw from the battery without it heating up to potentially risky levels. Batteries aimed at vaping will also list the pulse discharge rating, which is the current the battery can safely discharge in a pulse. In theory, this can be higher than the CDR, as the batteries have time to cool between pulses. However, as there’s no standard way of calculating this, it’s wise (and safer) to take this figure with a pinch of salt.
Finally, the capacity (in milliamp hours, or mAh) is the figure for the storage capacity of the battery, and how long it can carry on delivering current before it runs dry. As a rule of thumb, the higher the CDR, the lower the capacity, and vice versa, so there’s always some balancing to be done if you’re looking for a high CDR battery that also lasts a decent time between recharges. If you’re just looking for a longer-lasting battery for a device, just find one with the required CDR and the biggest capacity you can find.
Is there anything else worth looking out for?
Apart from checking that the battery will fit your device and any charger you’ve already purchased, it’s worth looking for a battery that comes with a protective casing and/or a plastic case, to protect the insulating wrap around the battery and the insulator at the pole from damage.
For safety’s sake, any batteries not in use should be stored in some kind of casing and away from any metallic objects, including loose change, paperclips, old screws or keys. Don’t just stick them in your junk drawer and forget them!
The best 18650 batteries in 2022
Samsung 25R: The best all-round 18650 battery
The Samsung 25R is a great all-rounder. While Samsung has actually stressed that this battery isn’t suitable or safe for vaping, it’s a good choice for other applications, with a high CDR of 20A and a capacity of 2500mAh. It’s also solidly constructed and as reliable as you’d expect from the brand, which is why you’ll regularly find them used in a wide range of electronic devices. We saw good performance in our pocket torch, which became warm but not worryingly hot while pumping out blinding quantities of light.
Key specs – Type: Flat topped, unprotected; Capacity: 2500mAh; Nominal voltage: 3.7V; CDR: 20A (approx); Max discharge: 20A
Sony VTC6: The best high-capacity 18650 battery
The Sony VTC6 is another battery that’s widely regarded in tinkering circles, thanks to a balance of high performance – a 20A CDR – and a high capacity of 3000mAh. Users are generally impressed with their stamina, both for electronics and for custom vape mods, and while they’re more expensive than your average 18650s, they’re well worth the extra money. Sony also produces a button-top variant with a 15A CDR, which is ideal for high-powered torches, and reliability is just what you’d expect from a major brand such as Sony.
Key specs – Type: Flat topped, unprotected; Capacity: 3000mAh; Nominal voltage: 3.6V; CDR: 20A (approx); Max discharge: 20A