Innokin Endura S1 Review: Disposable, Refillable, & Portable

The Innokin Endura S1 is a hybrid device that brings the user-friendliness of a disposable vape, as well as the longevity and performance of a pod vape. It’s a refillable disposable; a category that has been gaining traction, with more and more manufacturers starting to produce them.

But what is a refillable disposable? Well, in the case of the Endura S1, it has a 2ml tank which can be filled and refilled with your preferred ejuice up to 15 times. It can also be recharged with the Type-C charging port. This is all similar to a pod vape. 

However, the coil is built-in to the tank, so once it starts tasting off or funky, you simply dispose of the device and start using a new one, like you would with any other disposable.

Voila, you have a refillable disposable device.

The Endura S1 is designed to last for up to 7000 puffs. It uses the same coil technology that is found in Innokin’s other vapes, with a 0.8Ω mesh coil that Innokin says will deliver vivid flavor, satisfaction, and dense vapor, all without losing flavor.

The Endura S1 outputs a constant 13.5W for consistency, so the experience will be the same no matter what the battery level is. The Endura S1 has a built-in 650mAh battery that recharges with Type-C charging.

If you’re in the market for a new pod vape or disposable, should you get the Innokin Endura S1 instead? You’ll learn everything that you need to know in this detailed review.

Box Contents

• 1 x Innokin Endura S1 Pod Kit
• 1 x Quick Start Guide

Specifications

• Dimensions: 101mm x ∅18.5mm
• E-liquid Capacity: 2ml
• Wattage Output: Constant 13.5W
• Battery size: 650mAh
• Charging type: Type-C
• Built-in 0.8Ω Mesh Coil
• MTL draw

Design & Build Quality

The Innokin Endura S1 is a very small and portable device. It has the shape of a vape pen, with a height of 101mm and a diameter of 18.5mm. It’s smaller than most disposables that I’ve used lately, and even smaller than most of the pod vapes that I’ve used too. 

It’s a tube shaped device, save for the front portion of the device which features a thin flat section. The tube shape is nice to hold in the hand, and it’s easy to pocket or put in a bag. I also like the flat section because it gives my thumb somewhere to rest and feels natural when vaping.

Branding is kept to a minimum, with an Innokin logo and Endura S1 printed on the device. That’s about it though, so these keep a clean and minimalist look.

There are 8 colors available: Charcoal, Graphite, Silver, Pearl, Celadon, Cerulean, Irus, and Blush. The first four of these colors are solid with a matte-metallic finish, while the last four are gradients with a glossy finish. All of the colors are nice, but I like the matte-metallic solid colors the most.

In addition to the different colors, Charcoal, Graphite, and Silver have a tinted ejuice tank. The other five colors have a clear tank. While you can still see into the tinted tanks, it’s not quite as easy to see your remaining ejuice as with the clear ones. 

The tank is built onto the device and is non-removable. The coil inside is also non-removable. This is the ‘disposable’ aspect of these devices, as they are meant to be thrown away once the flavor starts to drop off.

The mouthpiece is surprisingly comfortable for a disposable device. It’s thin and oval shaped and fits nicely to the contour of my lips. It’s also just tall enough that I can hold the Endura S1 with my lips for a few hands-free puffs.

Located on the side of the tank is the fill port. The rubber bung that goes into the tank is thick and beefy, so it plugs the fill port nicely. The fill hole is also wide enough to fit all sizes of ejuice bottle nozzles and I didn’t have any issues with filling. The only thing to be mindful of is that since the fill port is located midway up the tank, you’ll want to fill the Endura S1 on its side in order to properly fill the tank.

The bottom of the Endura S1 has the Type-C charging port, an airflow hole, and an LED indicator. The light is dim enough that you can still get some stealth vaping in, even in poorly lit places, without attracting much attention.

For a disposable device, the Endura S1 feels like a good device and it doesn’t look too shabby either. I don’t think anyone would question you if you told them that it was a full-on pod vape, as it certainly doesn’t look like a disposable one.

Features

The Endura S1 is just as beginner friendly as other disposables, albeit with the ability to fill it with your own ejuice. The tank will hold up to 2ml of ejuice, which is about the same as most other pod vapes.

Inside of the tank is a 0.8Ω coil which Innokin says is best with 50VG ejuices. I tried using it with 60VG and, while it did work, I started to get the hints of dry hit with long pulls. You’re probably best to stick with 50VG for the best experience with the S1.

A really nice feature is that the S1 outputs a constant 13.5W, no matter what the battery charge is at. This makes for consistent vaping, where every draw feels the same, no matter if you’ve just charged it or have been vaping on it for dozens of pulls.

Innokin claims that the Endura S1 can be refilled up to 15 times (30ml of ejuice) and achieve up to 7000 puffs before needing to be disposed of. That’s a lot of vaping out of a refillable device, but certainly possible given the recent advances in vaping technology that have come out in the past year.

As for the battery, there’s a 650mAh battery that is built into the Endura S1. This battery will last for close to two full tanks of ejuice before needing to be recharged. Charging is done through the Type-C port on the bottom of the S1. A full charge takes about 90 minutes from start to finish, but you can vape on the S1 as it charges if need be.

How to use the Endura S1

As mentioned previously, the Endura S1 is very easy to use. Even someone that is completely new to vaping will have no trouble using it. Although it isn’t as easy to use as a disposable, it barely requires more work, and the benefit is that you get to use your own ejuice flavors rather than being stuck with whatever a disposable manufacturer offers.

To start, take the Endura S1 out of the box. The S1 uses a 0.8Ω mesh coil that is best used with nicotine salt ejuices of medium to high strength, such as 30mg to 50mg/ml, but freebase nicotine ejuices can also be used. As stated by Innokin, try to use an ejuice that is 50VG as this is what will wick and vape the best.

Unplug the fill port and tip the Endura S1 on its side. Fill the tank as much as you can and replace the fill port. Now, wait for 5-10 minutes for the coil to saturate. Once the wait is over, remove the sticker from the bottom of the device and vape away.

When the tank is depleted (after ~400 puffs), simply refill the tank and continue to vape. You can get around 15 refills (30ml of ejuice) out of the S1 before it starts to taste off, which is coincidentally the same amount of ejuice in your average nicotine salt ejuice bottle. Since the coil is non-removable, you’ll want to dispose of the S1 once its usable life is done and start using another one.

The LED indicator on the bottom of the S1 will be green when the battery level is above 15%. Once it’s below this level, the light will change to red. Since the light is so dim, it can be hard to notice when this happens, so you’ll want to consciously check on the LED every so often. I’ve had the S1 die on me, seemingly out of nowhere, all because I didn’t keep an eye on the LED.

While charging, the LED will glow red while the S1 is charging. Once it has reached a full charge, the LED will change to a solid green and you can unplug the device.

Performance

For a simple, disposable device, the Endura S1 performs at a level that is closer to a pod vape than to anything else. The mesh coil inside is really good, which is actually what I was expecting, seeing as Innokin’s other devices are generally good.

I used the Endura S1 with 50VG nicotine salt ejuices in 20mg, 25mg, and 35mg/ml strengths. The 0.8Ω mesh coil handled all of them well and delivered on flavor. It’s an experience that I would compare to other mid-range pod vapes; not the best that I’ve experienced, but above average for sure.

I tried to use higher VG ejuices like 60VG with the S1, but this didn’t last long. Longer draws would give me the beginnings of a dry hit, so I had to keep the draws short and give time between draws for the coil to rewick. It was a frustrating experience, so 50VG is really the only way to go with the Endura S1.

The draw is very nice. It’s a tight mouth-to-lung draw that will remind ex-smokers of puffing away on a cigarette. The vapor is pleasantly warm, verging on hot, but perfectly tolerable. The draw activation works without issue, activating instantly every time for a draw that doesn’t cut out and remains consistent.

The 13.5W constant output is one of my favorite features of the Endura S1. Constant output devices are simply better than devices where the draw gets weaker as the battery dies. Each draw feels the exact same, right up until the point that the battery dies. The only possible drawback with the S1 is that the LED indicator isn’t obvious because it’s located on the bottom, so unless you constantly check on the LED, you won’t get any warning when the battery is about to die.

I also would have liked to see an additional LED color for 30-75% battery, like a blue color. This would give more warning when the battery is getting low. As it is now, you can have a green LED and think you’re perfectly fine, only for the battery to be at 20% and go red quite quickly once it hits 15%. Some more warning would be nice with the S1.

Last and certainly not least, the 7000 puff count of the S1 is impressive. I’ve refilled my unit 10 times at this point, so somewhere around 4000 puffs, and it’s still going stronger than ever. There’s been a bit of a flavor drop, but not enough for me to replace it just yet. I can easily see the S1 achieving 7000 puffs before needing to be replaced.

Verdict

The Endura S1 is quite possibly the best ‘refillable disposable’ on the market right now. But, just who should buy one of these? 

I think there are two types of vapers that will like what the Endura S1 has to offer. If you’re a new vaper who wants a device that is as easy to use as can be, while still being able to use an ejuice in the flavor and strength of your choice, the Endura S1 is for you. Perhaps you like pod vapes and using your own ejuice, but not the hassle of changing coils. The Endura S1 is also for you.

Maybe you don’t fit into either of the above listed categories; that’s okay! If you like the sound of the Endura S1, then maybe it’s for you too! I don’t have too many bad things to say about it, other than the fact that there’s some unnecessary waste being created. However, it’s a little better than full-blown disposables that can’t be refilled, so I’ll give it that.

When you look at the whole picture, the Endura S1 is flavorful, delivers a tight MTL draw, and will last for 7000 puffs. For the price (~$10), you really can’t go wrong.

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