Overview
SkyRC D400 Ultimate Duo is a twin-channel balance charger / discharger / power supply designed to support 1-7S lithium batteries. It features two independent circuits for charging two different kinds of batteries simultaneously, and also supports power distribution in both AC and DC modes to help shorten charging time.
Key Features
- Twin-channel charger with two independent circuits for simultaneous charging of two batteries (same or different).
- Power distribution (AC/DC): example setting Channel 1 = 300W and Channel 2 = 100W (total 400W).
- Max power note: Channel 2 max power is 200W; Channel 1 max power is 400W.
- DC power supply mode: can supply 150W DC power on Channel 2; converts 100-240V AC mains to 6-15V DC output.
- Synchronization mode: allows setting both channels by Channel 1 for time-saving operation when charging the same batteries.
- PC software support for data analysis and firmware upgrade (Charge Master): start/stop charging, view real-time graphs of current/voltage/capacity, and monitor single-cell voltage.
- Functions shown: Balance Charge (6S LiPo), Program Data Store/Load, Battery Voltage Meter, Battery Resistance Meter, Terminal Voltage Control, PC Control, Maximum Safety, Discharge.
- Ports/labels shown: Output Socket (4mm Banana Plug), Temperature Sensor Port, USB Port, Micro USB Port for PC Link, Balance Lead Socket, DC Input 11-18V, DC Output, Cooling Fan.
For setup questions or compatibility help, contact support at https://rcdrone.top/ or email support@rcdrone.top.
Specifications
| Input Voltage | AC 100-240V/DC 11-18V |
| Charge Circuit Power | 400W |
| Discharge Circuit Power | 36W |
| Charger Current Range | 0.1-20A |
| Discharge Current Range | 0.1-5A |
| Current Drain for Balancing Port | Max 500mA/cell |
| Trickle Charging Current | 50mA-300mA & OFF |
| DC Power Supply Output | 6-15V/Max.10A |
| LiPo/LiFe/LiIon/LiHV Battery Cell Count | 1-7S |
| NiMH/NiCd Battery Cell Count | 1-18S |
| Pb Battery Voltage | 2-24V |
| Weight | 2510g |
| Size (L x W x H) | 258mm x 194mm x 82.5mm |
What’s Included
- D400
- AC Power Cord
- XH Adaptor
- Banana connectors with XT60 connector Charging Cable
- Charging Cable
- Instruction Manual
Applications
- Charging and balancing 1-7S lithium batteries (LiPo/LiFe/LiIon/LiHV)
- Charging NiMH/NiCd packs (1-18S) and Pb batteries (2-24V)
- Using Channel 2 as a DC power supply (6-15V, max 10A; 150W DC power on Channel 2 stated)
Details

The SkyRC Ultimate Duo 400W AC/DC charger provides dual-channel balance charging and supports 1–7S lithium batteries.

SkyRC D400 Ultimate Duo uses dual independent channels with front-mounted balance ports, USB/micro USB connections, and DC input (11–18V) for flexible bench or field charging.

SkyRC D400 Ultimate Duo supports twin-channel charging with adjustable power distribution, up to 400W on Channel 1 and 200W on Channel 2.

SkyRC D400 Ultimate Duo includes a DC power supply mode that converts 100–240V AC mains to 6–15V DC output and offers channel synchronization settings.

SkyRC Charge Master PC software lets you start or stop charging, view real-time current and voltage graphs, and perform firmware upgrades.

The SkyRC D400 package includes the D400 charger, an AC power cord, an XH adaptor, charging cables, and an instruction manual.

SkyRC D400 Ultimate Duo supports AC 100–240V or DC 11–18V input and measures 258 x 194 x 82.5mm for an easy bench setup.
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