Samsung 30Ts
The Samsung 30Ts are the best 21700s for high-wattage vaping. While not the longest lasting of the bunch (quite the contrary), if you are in the market for powerful 21700s you should get some 30Ts. Up to recently the only cells that could reliably go up to 100 watts, 30Ts are also ideal for 21700-compatible mech mods.

18650 batteries
18650 batteries are by far the most common batteries in vaping. They are reliable and extensively tested, and the most of the box mods are compatible with 18650 batteries.

Features:

The 20700 and 21700 have a capacity around 4000mAh. Bigger batteries = longer-lasting battery life, and the true is that these batteries have a higher amp rating (they support a continuous discharge of 30-45 amps), which means they can run at a higher wattage for much longer time.

The Molicel P26A is one of the best cells on the market. This cell outperforms even the all-time great VTC5A @ 25A and is authorised for use in vape devices, among other various applications.

At moderate power levels this Samsung 40T even beats the incredible Samsung 30T, hitting harder for almost the entire discharge down to 3.2V and for a lot longer too. The 40T still runs for longer though. This is a classic tradeoff, the 30T’s higher performance and current rating versus the 40T’s higher capacity.

The labels “18650” and “AA” technically just refer to different battery sizes. The key distinction is that the 18650 is specifically a size for a rechargeable lithium-ion battery while AA can be zinc-carbon, alkaline, nickel-cadmium, nickel-metal hydride (NiMH), or even lithium-ion among others.

When choosing a vape battery for your mod, it’s important to pick one which best suits your vaping needs. Batteries with higher Milliamp Hours (battery life) tend to have a lower discharge rate (lower Amperage, or how much power they can deliver at once). This makes them more suitable for lower wattage devices.

Being that the 21700 battery is slightly larger, it will also provide more energy/power and runtime. mAh’s on 18650 batteries will range from 2000 up to 3500. On 21700 batteries, you can expect mAh’s to range between 3000 up to 5000 mAh’s. You may see advertising for 18650 batteries that claim to have up to 9000 mAH.

Many wonder what the most significant difference between a 21700 battery and a 18650 battery. From a physical aspect, it is simple; the size is the difference. 21700 batteries are slightly larger than 18650 batteries. Being that the 21700 battery is slightly larger, it will also provide more energy/power and runtime.

The Sanyo NCR20700A is a high-performance 30A battery. The 20700 vape battery started appearing around mid-2017, with mods like the Innokin Oceanus. Besides vape mods, 20700 batteries are also being utilized for cordless power tools, flashlights, and electric vehicles.

Molicel P26A 18650 2600mAh 25A Battery

Samsung have advised against using their batteries in vape products. 18650s are by far the most common batteries in vaping. They are readily available, reliable, and extensively tested, and the vast majority of mods come with 18650 compatibility.

Another high-performing battery by Molicel, the P26A is a great option for vaping up to 75 watts and the best all-around 18650 on the market right now. 18650s are by far the most common batteries in vaping. They are readily available, reliable, and extensively tested, and the vast majority of mods come with 18650 compatibility.

One of the best 18650s for mechs if you build according to its amp limit, the VTC5A is also an excellent battery for use with regulated mods. The VTC6 comes with a whopping 3000 mAh and Sony’s reliable brand name.

With more and more companies coming out with 21700-compatible vape mods lately, these batteries are considered by many to be the future of vaping. Outside of vaping, 21700s are mainly used in the electric vehicle market (electric bikes and cars).