July 4th, 2019. XTAR launched its brand-new ST2 fast charger, capable of charging via the Type-C cable on the go. As the latest 2-slot quick charger of fast charging series, ST2 provides a unique experience of charging 2 Li-ion batteries separately and performs a maximum output of 4,100mA in 2-slot. It only takes 30 minutes to fully charged of a 2000mAh battery.
The LCD screen can display a real-time information of Battery’s Status, Internal Resistance, Charging Current, Battery Voltage, Charged Capacity and Temperature of battery. The specially designed Type-C input is available to support PD2.0 and QC3.0 protocols, compatible with various adapters to ensure endless power supply.
XTAR ST2 battery charger can enable an automatic detection of battery internal resistance and automatic selection of the appropriate charging current for the battery when it is being insert into the slot. It compatible with 3.6V/3.7V Li-ion/IMR/INR/ICR 18650, 20700, 21700, 22650, 26650 batteries. The Built-in high-precision MCU ensure that the cut-off voltage is always within safe limits to extend the lifespan of the batteries, which is safe and worry-free.
The Multiple protections ensure safe charging, built-in protection system can effectively prevent anti-short circuiting and reverse polarity protection, overtime charging protection, over-discharged Li-ion battery activation and over-discharged, combined with XTAR’s original soft-start function, making charging safer.
Your charger XTAR covered.
XTAR products and ST2 are sold at Amazon, eBay, Shopee & Aliexpress. To learn more about ST2, please click: ST2 or visit: www.xtar.cc
Bit of a clickbait title considering the #1 factor for healthy charge speed is the battery, not the charger. i can’t imagine 4A being good for a 2000mAh cell
Looks like a nice charger though.
That looks like an Xtar Over Four slim.
Without the mains adapter and USB out ports.
4100mA Charge current and 2000mAh battery does not mean it charges in 30 minutes
at the end of charge the battery gets charged in CV with current going down slowly until termination
you may get 80-90% but not full
[Reviews] Miboxer C4-12, C2-4k+6k, C2, C4 / Astrolux K1, MF01, MF02, S42, K01, TI3A / BLF Q8 / Kalrus G35, XT11GT / Nitefox UT20 / Niwalker BK-FA30S / Sofirn SF36, SP35 / Imalent DM21TW / Wuben I333 / Ravemen PR1200 / CL06 lantern / Xanes headlamp
[Mods] Skilhunt H03 short / Klarus XT11GT, XT12GTS / Zebralight SC50+ / Imalent DM21TW / colorful anodisation
[Sale]
Drivers: overview of sizes and types
DD+AMC based drivers Anduril or Bistro OTSM 12-24mm, S42, 24-30mm L6, Q8, MF01(S), MT03, TN42
Anduril or Bistro 8A buck driver for 20-30mm, MF01/02/04, TN40/42, Lumintop GT, MT09R
UVC and UVC+UVA drivers
programming key
Remote switch tail DD board with FET
Aux boards:
Emisar D1, D1S, D4, D4S, D18, Lumintop FW3A, Fireflies ROT66, Astrolux MF01, Tail boards like S2+
It is even faster, Fully Charged in 10 Minutes if you put a 700mAh Crapfire in there.
link to djozz tests
Is it unintentional coincidence that this charger is being presented on Independence Day?
ROFLMAO!!
== We save the planet from darkness ==
I really like seeing flashlights and chargers adopt USB-C. I hope the trend speeds up and we see more devices soon.
Is that smoke I see in the first photo?
OMG!!!
See that smoke venting out of the battery terminals? 
They probably fried some rewrapped Doolidoodaaa cells with 4.1 amps. 
OTOH, maybe they just wanted to advertise this charger to heavy vapers and white smoke just looked like the right thing...
Did anyone bother to notify Tesla about this?
Perhaps they can make some improvements to it and have it fully re-charge the car in 15 minutes?
***Rofis MR70*TurnRaise*Catapult V6*BLF Q8*BLF Mini*BLF Micro*Haikelite MT09R* Convoy C8*BLF D80v2 SST40*MatemincoX6S*AstroluxFT03-xhp50.2*AstroluxFT03-sst40*BLF-LT1*AstroluxFT03S-SBT90.2***
Tesla model 3’s, when using a super charger or other 250kW charging station already charge at the rediculous rate of 15 miles of range gained back per minute.
10 min of charging will drive you 150 miles!
Charging speed is not determined by output amps but C rating, so this is technically false advertising. Even more so considering the math behind 30 minutes completely skips the CV phase.
USB power meter/tester thread
and for 100 Testlas charging at the same time you need to build a new medium-sized coal power plant
electrical cars are with today’s battery technology an economical and ecological disaster
[Reviews] Miboxer C4-12, C2-4k+6k, C2, C4 / Astrolux K1, MF01, MF02, S42, K01, TI3A / BLF Q8 / Kalrus G35, XT11GT / Nitefox UT20 / Niwalker BK-FA30S / Sofirn SF36, SP35 / Imalent DM21TW / Wuben I333 / Ravemen PR1200 / CL06 lantern / Xanes headlamp
[Mods] Skilhunt H03 short / Klarus XT11GT, XT12GTS / Zebralight SC50+ / Imalent DM21TW / colorful anodisation
[Sale]
Drivers: overview of sizes and types
DD+AMC based drivers Anduril or Bistro OTSM 12-24mm, S42, 24-30mm L6, Q8, MF01(S), MT03, TN42
Anduril or Bistro 8A buck driver for 20-30mm, MF01/02/04, TN40/42, Lumintop GT, MT09R
UVC and UVC+UVA drivers
programming key
Remote switch tail DD board with FET
Aux boards:
Emisar D1, D1S, D4, D4S, D18, Lumintop FW3A, Fireflies ROT66, Astrolux MF01, Tail boards like S2+
In some countries without heavy regulations the power companies will always go for the cheapest way to generate the electricity, along with the waste created by lithium cell production they’re probably not so much greener after all. At least for the time being.
My country gets the power from hydro and on dry seasons there are regulations for turning off the central AC and large luminous signs for small and large business for hours each day. I can’t imagine how would that work if we add a considerable amount of electric cars each capable of drawing the same power as several households. Electric cars are imported 100% tax free and there are already more charging stations than Teslas cars in the city thanks to corporations trying to look “green”. I suppose it won’t take long until the government steps in and add even more free charging stations.
People tend to view electric power as unlimited and sustainable, and everything that looks Smokey bad and harmful, including steam. The media sold it well I guess.
USB power meter/tester thread
@ will34:
And to think of the infrastructures that’ll have to be beefed up.
There is a push to build with renewables, and that is applaudable. The transport and substations, the delivery of 3 phase 550 / 600 (440 / 480 US) volt to new locations as parking areas and residentials, that will be an undertaking. The grids are built for the present demands; these will need to increase exponentially.
Say hello to brownouts…
And to extend the lifespan of the batteries, charging a 2Ah cell with 4.1A current is probably not such a great idea.
The marketing leaves questions:
4,100 mA in two slots – would that be 2.1 A per slot?
Claim of fast charging a 2000 mAh battery in 30 minutes but (fuzzy) pictured 2600mAh cell*.
Second photo of a 4200mAh cell (presumably a 21700) not in charger with display results – ’100%’ states nothing of charge rate (can’t make out the rest of LCD).
Xtar makes some good chargers, re-think your marketing.
They’re probably assuming the cell isn’t fully depleted to begin with, but maybe at some 30% at the start of charging? But without stating it as such, yeah, that’s some shady advertising. I’d expect better from XTAR.
High current also mean increases the battery internal temperature which can probably operating beyond the battery specification charge current. I’ve read that “heating” the battery too hard could potential have done some damage to battery and life cycle.
High current cell aren’t that cheap and you don’t definitly want something tearing off your battery.
That the first case, 2nd is when the charger charge li ion cell beyond 4.20v threshold and stay there for pro long time also one of the reason of why internal battery’s temperature to rise much higher than specs and worst of all, likely to harm battery life cycle.
I’ve also been seen that 3amps charge can push cell temperature up to 40 celcius which is still ok but for me pretty darn high. Now we have 4amp, wonder how that will look like…
In search of the most ideal flashlight in town:
1. BRIGHTNESS
2. Durabillity
3. Design
4. Quality
5. Price$$$
Gonna have to disagree with you here. And why burn coal for the electricity? Why not generate it renewably?
Yeah.
Why not use even natural gas for that? If you want to use fossil fuels, use one that produces 50% of CO2 and other bad chemicals compared to coal.
Solar panels, biomass recycling, high altitude wind, heat recycling by using molten salts, etc.
We need to be smart, and be efficient.
My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547
or nuclear power plant, which is cheaper and cleaner.
Forgot my pen
Because there are few countries with anything like the renewable capacity for charging large numbers of electric vehicles. The UK is already looking at electricity shortages in the future, large EV use will make that worse.
This forum may contain nuts.
No animals were harmed in the creation of this post.
Be nice to people. It annoys them no end.
Nice battery boiler you got there xtar
LOL
I think that’s a misprint because I would assume they would also state 8.2A
Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5, Xtar PB2S 5/5
Waiting for: (DQG Tiny) 21700 EDCs.
You can see 4.1A indicated on both slots on the LCD display. And they also state “fully charge two 18650 cells in only 30 minutes”.
Yes, you are totally right that’s on the display.
But the display also states 100%.
But at 100% it won’t charge a 4.1A. So I wonder it’s just photoshopped for advertising reasons.
Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5, Xtar PB2S 5/5
Waiting for: (DQG Tiny) 21700 EDCs.
Some chargers just show the selected rate, not the actual current as it gets reduced during CV phase.
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