Parts/Batteries & charging/Chargers/iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)
iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)
iSDT

iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)

Part # ISD-K44.8(6)
Where to buy
$239.99
AMain Hobbies
Seen Oct 12, 2026
$239.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

The iSDT line of chargers has proven to become a staple within the R/C community, meeting a wide variety of charging requirements, while doing so at a budget friendly price. The K4 is no different, delivering ample performance for most, a wide feature set, and simplicity that you come to expect from iSDT. 

The K4 duo charger can charge two batteries at once, and features both AC or DC input, so you can take it anywhere (or no where) to charge a wide type of R/C batteries! It's AC (100-240V) performance is healthy, delivering up to 400W of total charging power. When connected to DC (10-34V), this charger steps up a bit more, and can push up to 600W at each port to power your batteries!

 
Features:

  • BattAir Interconnection Technology (with compatible BattAir supported batteries)
  • Dual Output Charging
  • AC/DC Input
  • Up to 400W AC output (total)
  • Up to 600W DC output (each channel)
Specifications:
Input voltage: 
AC: 100-240V
DC: 10-34V
Output voltage: 1-34V
Max. input current: 45A
Charging current: 0.2-20A x2
Discharging current: 0.2-3.0A x2
Balance current: 1.5A/Cell Max
Max. discharging power: 30W x2
Battery Compatibility: LiFe/Lilon/LiPo 1-8S, LiHv 1-7S, Pb 1-14S, NiMH 1-18S
Output interface: XT60
Input interface: XT90
Working temperature: 0-40 Celsius
Storage temperature: -20-60 Celsius
Dimension: 176-183-57mm
Weight: 1230g

CA Residents Prop 65 Warning WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details...

Reviews4.8 · 6 reviews

parker whitmireon iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)

Amazing charger that is incredibly simple to use. ease of use is like no other, it has to be one of the most powerful chargers that can run off AC. Also, the capability to use DC is awesome.

3 found this helpful
Brian A FunkVerified owneron iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)

Really good charger and it's not as finicky as other chargers especially Traxxas.

1 found this helpful
GriffinVerified owneron iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)

Had it for a couple months now and been quite happy with it. Got it because of the 1.5a balance current, realtime resistance meter, and 30w discharge. Charges 2s race packs at the track quickly and quietly. For a casual racer, beats hauling around a power supply, charger, and stand around.

1 found this helpful
mark weirVerified owneron iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)

Fast charge rates dual port this charge is a winner. I can run all day with only 3 packs in rotation. @slashyourfaceoff

Adam HookerVerified owneron iSDT K4 Smart AC/DC Lithium Battery Charger (8S/20A/600W DC, 400W AC)

4 out of 5 stars because nothing is perfect. If you don't have the money for the K4 I suggest going with a K2. So far I can't get either to work with ISDT go. It only works with ISDT link.

What reviewers say

Reviewers generally rate the iSDT K4 Smart AC/DC charger highly, with five of six reviews at 5/5 and one at 4/5. Praise centres on ease of use, fast charging, dual-port operation, DC and AC capability, quality construction, Bluetooth, and variable fan speed. One reviewer, a casual racer, values the balance current, real-time resistance meter, and 30W discharge for charging 2S race packs at the track. One reviewer says the charger is less finicky than Traxxas chargers. The one recurring complaint is compatibility: a 4/5 reviewer could not get the K4 or K2 to work with the ISDT Go and said it only works with ISDT Link. Reviews do not mention the AC/DC ratings in detail beyond general praise.

  • + Simple, easy to use
  • + Fast charging, dual port
  • + AC and DC operation
  • + Quality construction and Bluetooth
  • − Only works with ISDT Link (ISDT Go compatibility problem)
  • − Higher price than K2 per one reviewer
Summary generated from the reviews above.

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