{"product_id":"efest-slim-k4-vape-battery-charger","title":"Efest Slim K4 Vape Battery Charger","description":"\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eEfest Slim K4 Vape Battery Charger\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFour bays and a USB-C port. That is genuinely all you need to know about the \u003c\/span\u003e\u003cstrong\u003eEfest Slim K4\u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003eif you are in a hurry. For everyone else: this is a smart\u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-battery-chargers\"\u003e \u003c\/a\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-battery-chargers\" target=\"_blank\" title=\"Battery Charger\" rel=\"noopener\"\u003e\u003cstrong\u003eB\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-battery-chargers\" target=\"_blank\" title=\"Battery Charger\" rel=\"noopener\"\u003e\u003cstrong\u003eattery Charger\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e that takes \u003c\/span\u003e\u003cstrong\u003e18650, 20700, 21700\u003c\/strong\u003e\u003cspan\u003e, and over a dozen other lithium cell sizes, detects how many you have loaded, and sets the charging current on its own. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eTwo cells get \u003c\/span\u003e\u003cspan\u003e1.0A each\u003c\/span\u003e\u003cspan\u003e. Fill all four bays, and it drops to \u003c\/span\u003e\u003cspan\u003e0.5A per slot\u003c\/span\u003e\u003cspan\u003e. Flame-retardant ABS body, five built-in safety protections, and an \u003cstrong\u003eLCD panel \u003c\/strong\u003eso you can actually see what each bay is doing. Keeps your whole battery rotation ready without thinking about it. Over 18s only.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWhy vapers choose the Slim K4:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFour independent bays\u003c\/span\u003e\u003cspan\u003e so you can charge a full day's rotation of 18650s or 21700s in one go, each slot doing its own thing without waiting for the others\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eUSB-C at 5V\/2A\u003c\/span\u003e\u003cspan\u003e is a proper upgrade over older barrel-jack Efest models. Laptop, wall adapter, power bank. Whatever you have nearby works.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eCurrent drops automatically\u003c\/span\u003e\u003cspan\u003e from 1.0A to 0.5A when you fill all four slots. No switches, no menus. Just batteries in, current sorted.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eReverse polarity protection\u003c\/span\u003e\u003cspan\u003e means putting a cell in backwards does not fry anything. Honestly, a bigger deal than it sounds.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eLCD panel\u003c\/span\u003e\u003cspan\u003e tells you which bays are charging and which are done. Sounds basic until you are juggling six batteries across a week and forget which pair you swapped out.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eEfest Slim K4 Vape Battery Charger Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eWhy USB-C Changes the Equation\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eRemember the old Efest chargers with those chunky barrel-jack adapters? Lose the adapter and the charger becomes a paperweight. The\u003cstrong\u003e Slim K4 \u003c\/strong\u003eruns on USB-C. Any cable, any adapter rated at 5V\/2A. Charge your\u003c\/span\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-batteries\" target=\"_blank\" title=\" Vape Batteries \" rel=\"noopener\"\u003e\u003cstrong\u003e Vape Batteries\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e from a wall plug at home, a laptop at work, or a power bank on the train. One universal connector and you are sorted.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eThat Automatic Current Thing Actually Works\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSome chargers claim smart detection. The \u003cstrong\u003eSlim K4 \u003c\/strong\u003edelivers on it. Two cells loaded? \u003c\/span\u003e\u003cspan\u003e1.0A each\u003c\/span\u003e\u003cspan\u003e for a faster top-up. Four cells? It splits to \u003c\/span\u003e\u003cspan\u003e0.5A per bay\u003c\/span\u003e\u003cspan\u003e automatically. You never touch a setting. Thing is, most vapers charge two cells at a time anyway, so you get the faster speed more often than not. When you do load all four, the trade-off is just a longer wait. Fair enough.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eFive Safety Layers, One That Matters Most\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eShort circuit, overcharge, over-discharge, overvoltage, reverse polarity. All five run simultaneously. But honestly? Reverse polarity protection is the one that earns its keep. Everyone has fumbled a battery into a charger the wrong way around at least once. With cheaper chargers, that is a problem. With the Slim K4, the bay simply refuses to charge until you flip the cell. No sparks, no damage, no drama.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eThe LCD Earns Its Space\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt is not a colour screen. It is not fancy. But it shows you exactly which of the four bays is actively charging and which has hit the \u003c\/span\u003e\u003cspan\u003e4.2V cut-off\u003c\/span\u003e\u003cspan\u003e. When you are rotating through multiple pairs of 18650s across a week, that simple readout stops you from grabbing a half-charged cell by mistake. Practical, not flashy.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eFits the Batteries You Actually Use\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe three sizes that matter for vaping: \u003c\/span\u003e\u003cspan\u003e18650\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003e20700\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003e21700\u003c\/span\u003e\u003cspan\u003e. Those cover the vast majority of\u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/regulated-mods\"\u003e \u003c\/a\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/regulated-mods\" target=\"_blank\" title=\"Regulated Mods\" rel=\"noopener\"\u003e\u003cstrong\u003eR\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/regulated-mods\" target=\"_blank\" title=\"Regulated Mods\" rel=\"noopener\"\u003e\u003cstrong\u003eegulated Mods\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e, mech tubes, and\u003c\/span\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/box-mods\" target=\"_blank\" title=\" Box Mods \" rel=\"noopener\"\u003e\u003cstrong\u003e Box Mods\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e on the market right now. The Slim K4 also handles smaller cells like 18350s and 16340s for compact setups, and 26650s for the high-capacity crowd. Practically speaking? If your device takes a removable cell, this charger probably fits it.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eHow to Set Up the Efest Slim K4 Vape Battery Charger\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eDead simple. Under a minute to get charging.\u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003ePlug the USB-C cable into the back of the charger.\u003c\/span\u003e\u003cspan\u003e Connect the other end to a wall adapter, laptop, or power bank. Anything that outputs 5V\/2A through USB-C works.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eGive your batteries a quick once-over before loading them.\u003c\/span\u003e\u003cspan\u003e Torn wraps, dents around the positive cap, any visible damage at all: do not charge that cell. Bin it responsibly or get it re-wrapped.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eDrop each battery into a bay, positive end up.\u003c\/span\u003e\u003cspan\u003e The spring contacts inside the bay stretch to fit cells from short 14500s all the way up to full-length 26650s and 21700s.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eWatch the LCD light up.\u003c\/span\u003e\u003cspan\u003e Each occupied bay registers within a few seconds and starts showing its charging status independently.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eWalk away.\u003c\/span\u003e\u003cspan\u003e Leave the charger on a hard, flat, non-flammable surface. The Slim K4 cuts off at \u003c\/span\u003e\u003cspan\u003e4.2V\u003c\/span\u003e\u003cspan\u003e per cell automatically, but keeping it somewhere visible while it works is still good practice.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eGrab your cells when the display shows full.\u003c\/span\u003e\u003cspan\u003e Unplug the charger afterwards. No reason to leave it powered with empty bays.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhat's in the Efest Slim K4 Box\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe charger itself. A USB-C cable. User manual and warranty card. That is it. No wall adapter included, no batteries. You bring your own power source and your own cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eBuilt for Every Removable-Cell Vape Mod\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIf you run a\u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-mods\"\u003e \u003c\/a\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-mods\" target=\"_blank\" title=\"Vape Mod\" rel=\"noopener\"\u003e\u003cstrong\u003eV\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-mods\" target=\"_blank\" title=\"Vape Mod\" rel=\"noopener\"\u003e\u003cstrong\u003eape Mod\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e with removable batteries, you already know the drill. Rotate cells, keep spares topped up, do not get caught with a dead 18650 at 3 pm. The Slim K4 handles that entire rotation from one compact unit. \u003cstrong\u003e18650s \u003c\/strong\u003eand \u003cstrong\u003e21700s\u003c\/strong\u003e are the obvious ones. But it also covers the smaller 18350s that go into compact mechs, and the chunkier 26650s for high-drain builds.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eNot for built-in battery devices, obviously. If your\u003cstrong\u003e pod kit \u003c\/strong\u003eor pen \u003cstrong\u003evape charges\u003c\/strong\u003e via its own USB port, that is a different situation entirely. The Slim K4 is purely for removable lithium-ion cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eAbout Efest\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eShenzhen Fest Technology has been making battery chargers and accessories for the vaping market for years now. Their range runs from compact single-bay travel chargers up to six-bay stations, and the Slim K4 sits right in the middle as the workhorse option for vapers running two to four cells. The three-year manufacturer warranty is longer than what most competing brands offer at a similar price. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eMoving to USB-C on this model was a smart call. It made the older barrel-jack versions feel instantly outdated, and it means the\u003cstrong\u003e Slim K4 fits \u003c\/strong\u003einto the same cable ecosystem as your phone, your laptop, and half your other devices.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eStock Up and Save\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOne charger sorts your entire battery setup. Pair it with a fresh set of 18650s or 21700s, and you are covered for months. \u003c\/span\u003e\u003cstrong\u003ePirate Vapes\u003c\/strong\u003e\u003cspan\u003e ships every order the same day before 4 pm, packed securely so your charger arrives without a scratch. Age-verified checkout, over 18s only. Spend over £25 and delivery is on us with Free Pirate Post.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eConclusion\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe\u003cstrong\u003e Efest Slim K4 \u003c\/strong\u003edoes exactly one job and does it well. Four bays, \u003cstrong\u003eUSB-C input\u003c\/strong\u003e, intelligent current that adjusts itself, and enough safety protection to handle the occasional fumble. It charges the battery sizes that matter for vaping, fits on a desk or in a bag, and the\u003cstrong\u003e LCD panel \u003c\/strong\u003ekeeps you informed without overcomplicating things. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIf you use removable batteries, you need a charger you can trust. This is a good one. Browse more\u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-accessories\"\u003e \u003c\/a\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-accessories\" target=\"_blank\" title=\"Vape Accessories\" rel=\"noopener\"\u003e\u003cstrong\u003eV\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/piratevapes.co.uk\/collections\/vape-accessories\" target=\"_blank\" title=\"Vape Accessories\" rel=\"noopener\"\u003e\u003cstrong\u003eape Accessories\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e and batteries at\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePirate Vapes\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eFAQs\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eWhat batteries does the Slim K4 charge?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e3.6V and 3.7V lithium-ion cells.\u003c\/span\u003e\u003cspan\u003e The big three for vaping are 18650, 20700, and 21700. It also fits a wide range of smaller and larger sizes.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eHow long does a full charge take?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eDepends on how many bays you fill. Two cells charge at \u003c\/span\u003e\u003cspan\u003e1.0A each\u003c\/span\u003e\u003cspan\u003e, so a typical 18650 finishes in roughly three to four hours. Four cells at \u003c\/span\u003e\u003cspan\u003e0.5A each\u003c\/span\u003e\u003cspan\u003e takes closer to five or six.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eDo I need a specific wall adapter?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eNo. Any USB-C adapter rated at 5V\/2A works. Most modern phone chargers will do the job.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eCan I mix battery sizes in the same charge?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYes. Each bay is independent. An 18650 in slot one and a 21700 in slot three is perfectly fine. No interference.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eDoes it overcharge?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIt does not. The Slim K4 cuts power at \u003c\/span\u003e\u003cspan\u003e4.2V\u003c\/span\u003e\u003cspan\u003e per cell. Once full, that bay stops. You do not need to time it or watch it.\u003c\/span\u003e\u003c\/p\u003e","brand":"Efest","offers":[{"title":"Default Title","offer_id":52564240990490,"sku":null,"price":13.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/5675\/3690\/files\/Efest_Slim_K4_Vape_Battery_Charger.jpg?v=1784720953","url":"https:\/\/piratevapes.co.uk\/products\/efest-slim-k4-vape-battery-charger","provider":"Pirate Vapes","version":"1.0","type":"link"}