Your HOTA D6 Pro can reduce charging current when two batteries ask for more power than its input setup can deliver. On AC, both channels share 200W. The 650W DC headline requires a suitable external source, and each channel still has its own limit. Current falling near full charge can instead be normal voltage taper, even with power to spare.
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HOTA D6 Pro Dual Battery Charger
The HOTA D6 Pro is a dual-channel AC/DC balance charger for conventional FPV and RC battery packs, with two outputs and support for multiple battery chemistries. Best for: Pilots managing several 2S–6S FPV batteries.…
The HOTA D6 Pro is a dual-channel AC/DC balance charger for conventional FPV and RC battery packs, with two outputs and support for multiple battery chemistries.
- Best for
- A versatile dual-channel AC/DC charger for conventional FPV and RC packs; buyers must verify…
- Product type
- Battery Chargers
- Best for
- A versatile dual-channel AC/DC charger for conventional FPV and RC packs; buyers must verify…
- Product type
- Dual-Channel Balance Charger
Start with the power budget for your input
The figures below apply to the D6 Pro AC/DC model. HOTA publishes separate documentation and firmware for other models, so check the name on your unit before using these limits.
| Power input or limit | Manufacturer rating | What controls two-battery charging |
|---|---|---|
| AC input | 100–240V AC; 200W charging power with automatic distribution | Both channels share the 200W total. |
| DC input | 6.5–30V DC; up to 325W per channel at input voltage above 24V | 650W combined requires sufficient source power; one channel remains limited to 325W. |
| Charge current | 0.1–15A per channel | The current setting cannot override the available watts or the battery's allowed rate. |
AC and DC are alternative input arrangements, not wattages to add together. The DC voltage range describes acceptable input voltage; it does not promise maximum output throughout that range. A source that merely powers the display may be inadequate for the requested charging load.
For broader connector, battery and ownership considerations, read the HOTA D6 Pro review. Compare your two requested charge currents with the available watts.
Why voltage changes the current you can get
Charging power in watts equals pack voltage in volts multiplied by charging current in amps. Add the two channels to calculate the combined battery-side demand:
Total charging power = (channel 1 pack voltage × channel 1 current) + (channel 2 pack voltage × channel 2 current).
Use the voltage during charging, rather than only the nominal voltage printed on the pack. For conventional LiPo, the HOTA operating manual lists a 4.20V-per-cell endpoint. That makes 6S 25.2V and 4S 16.8V. These are power-sizing points; actual current normally tapers as the battery reaches its endpoint. Do not apply the LiPo target to another chemistry.
For an illustrative 100W allocation, a channel could supply at most 100 ÷ 22.2 = 4.50A at 22.2V, falling to 100 ÷ 25.2 = 3.97A at 25.2V. That is a power ceiling: voltage rises, so fewer amps fit inside the same watts. The calculation does not promise a fixed 100W allocation to each channel.
DC operation retains a separate channel ceiling. At 25.2V, 325 ÷ 25.2 = 12.90A, so a 6S channel cannot sustain the full 15A setting there. At 16.8V, 325 ÷ 16.8 = 19.35A on paper, but the 15A current ceiling takes over. Neither result authorizes that current for your battery.
Two examples: when the second battery should matter
Both examples assume two hypothetical conventional 6S LiPo packs whose manufacturers permit 1C charging. At 1C, charging amps equal capacity in amp-hours. These scenarios demonstrate power demand, not the compatibility or permitted charging rate of a particular pack.
Example 1: two 1,500mAh packs at 1.5A
Each pack has a capacity of 1.5Ah, so the assumed 1C setting is 1.5A. At the 25.2V sizing endpoint:
One channel: 25.2V × 1.5A = 37.8W. Two channels: 37.8W × 2 = 75.6W.
The calculated margin below the shared 200W AC rating is 200 − 75.6 = 124.4W. Merely adding this second pack should not require a reduction because of the AC wattage ceiling. If current is low, check where the packs are in their charge cycle and whether the displayed task and settings match your intention.
Example 2: two 5,000mAh packs at 5A
Each hypothetical pack is 5Ah, giving a 5A setting at the assumed 1C rate. At the same endpoint:
One channel: 25.2V × 5A = 126W. Two channels: 126W × 2 = 252W.
The combined request exceeds the AC rating by 52W. With both packs at the same voltage and both requesting 5A, the 200W boundary is reached at 200 ÷ (5 + 5) = 20V per pack. Above that point, both currents cannot remain at 5A on AC.
An equal 100W split would yield the calculated 3.97A ceiling per channel at 25.2V. Do not treat that as a predicted display reading: different pack voltages, current settings and charging stages can change the allocation. If both batteries permit it, a deliberately lower request of 3.9A per pack would require 25.2 × 3.9 × 2 = 196.56W at the endpoint. That fits the headline AC budget narrowly, but is neither a guaranteed operating point nor permission to exceed a battery's limit.
You can reduce the requested currents, charge one pack at a time, or evaluate a properly sized DC setup. A single 5A channel in this example requests only 126W. If you need help translating your own pack capacity into equipment requirements, the 6S LiPo charger guide covers that selection decision.
Check the source before increasing an input setting
The D6 Pro manual identifies Max. Input Power and Min. Input Voltage in System Parameters. Check these against your actual DC source. Raising a menu limit does not increase what a source, connector or lead can safely deliver.
Keep input and output budgets separate. The calculations above describe energy delivered to batteries. A DC supply must additionally cover conversion losses and charger consumption. Texas Instruments' battery-charger design explanation discusses those conversion losses; it does not establish a measured efficiency for this HOTA charger. There is no defensible universal percentage to add here.
Before considering higher DC output, verify the source's continuous voltage and current ratings, the complete cable path and the charger's permitted input range. Stop the charging task before changing the power arrangement. Do not buy an unspecified power supply simply because its headline wattage exceeds your calculated output demand.
For software identification, HOTA's support page supplied a D6 Pro archive containing HOTA D6 Pro V1.0.53.prg on September 9, 2026. Its linked Chinese operating manual and the English manual cited here identify version 1.1.8. Those document and firmware numbers are different identifiers. Follow HOTA's model-specific update instructions if an update is needed; a firmware listing is not evidence of a higher AC rating.
Separate a power limit from a normal finishing stage
In constant-current charging, the charger aims to hold the selected current as voltage rises. In the constant-voltage finishing stage, it holds the target voltage while current falls. Texas Instruments explains this distinction. More available supply power cannot make a battery remain in the constant-current stage after voltage regulation takes over.
- Both channels demand substantial power before the endpoint: calculate each channel's volts × amps and add them. A combined value near the AC budget supports a power-limit explanation.
- One pack is near its target voltage and its current is declining: that pattern is consistent with normal taper. Check cell readings and warnings before attributing it to the second channel.
- Total output is well below the budget while neither pack is near its endpoint: check selected current, task, input settings and any warning. The shared AC maximum alone does not explain every low reading.
HOTA also notes that cell-voltage differences affect balancing time. Read the individual cell values as well as total pack voltage. Keep the correct main and balance leads on the same channel, retain the proper chemistry and current, and keep cooling openings clear. Supervise charging and stop if the pack or charger behaves abnormally; do not bypass a warning to obtain a higher current.
Make the next charge a power-budget check
Write down your input type, both selected currents, both pack voltages and both actual currents. Compare the combined output with the applicable budget, then check whether either battery has reached its voltage-limited finishing stage. This separates a load the charger cannot sustain from a battery that is simply finishing normally.
For the small-pack example, AC wattage is ample. For the larger example, two 5A requests exceed the AC budget. Change the requested load or verify an appropriate DC arrangement only when the numbers justify it, while keeping each battery within its own permitted charging limits.
Sources
- HOTA D6 Pro product specifications: manufacturer ratings, DC voltage condition and automatic AC power distribution.
- HOTA D6 Pro operating instructions, version 1.1.8: manufacturer manual mirrored by Rotorama; battery parameters, input settings, balancing and operation.
- HOTA support downloads: D6 Pro firmware archive and current linked Chinese manual.
- Texas Instruments battery-charger technical article: constant-current and constant-voltage behavior and conversion losses.
Last checked: September 9, 2026.
