The Blackcell X4 is the 4-bay version of the Blackcell charging lineup, built for anyone running multiple devices or keeping a full rotation of batteries charged and ready. It uses the same microcomputer-controlled intelligent charging as the X2 but doubles the capacity, making it the better pick for dual-battery mod users or households with more than one vaper.
All four bays operate independently, so any combination of battery sizes and charge levels can be handled at the same time. The charger uses CC/CV/dV charging modes to move through each phase of the charge cycle automatically. LED indicators on each bay show charge status at a glance. It supports 18650, 20700, 21700, and other common lithium-ion cell sizes. Simple, reliable, and built to keep a battery collection in good shape.
Quick Links: All Batteries & Chargers
Blackcell X4 Battery Charger Specs at a Glance
| Spec |
Details |
| Number of Bays |
4 |
| Charging Modes |
CC/CV/dV (microcomputer-controlled) |
| Bay Operation |
Independent (each bay charges separately) |
| Compatible Batteries |
18650, 20700, 21700, and other lithium-ion sizes |
| Status Indicators |
LED indicators per bay |
| Safety Protections |
Overcharge, over-discharge, short-circuit, reverse polarity |
Why Four Bays Matter
A 2-bay charger works fine for single-battery mods. But a dual-battery mod means swapping in a married pair at the same time, which already fills both bays on a 2-bay charger. If those batteries are still charging when a second set runs out, the cycle stalls. The X4 eliminates that bottleneck. Two pairs can charge simultaneously, or a mix of different batteries from different devices can all go in at once.
The independent bay operation is critical here. Each bay applies its own charge profile based on the battery it detects. A half-drained 21700 in bay one and a nearly dead 18650 in bay three will each receive the correct current and voltage for their individual state of charge. No balancing issues, no compromises.
Intelligent Charging Protection
The X4's microcomputer manages the full CC/CV/dV charge cycle automatically. Constant Current (CC) handles the bulk charge phase. Constant Voltage (CV) tops off the cell gently. Delta Voltage (dV) detection identifies when the battery is truly full and terminates charging to prevent overcharge.
Beyond the charging algorithm, the X4 includes hardware-level safety protections: overcharge, over-discharge, short-circuit, and reverse polarity detection. If a battery is inserted backwards, the charger will not attempt to charge it. These protections make the X4 significantly safer than relying on USB passthrough charging built into mods.
Frequently Asked Questions
What battery sizes does the Blackcell X4 Battery Charger support?
The Blackcell X4 supports all common lithium-ion battery sizes used in vaping, including 18650, 20700, and 21700 cells. The spring-loaded bays automatically adjust to accommodate different battery lengths. Both flat-top and button-top batteries are compatible.
Can the Blackcell X4 Battery Charger charge four different batteries at the same time?
Yes. All four bays operate independently. Four different battery sizes or batteries at completely different charge levels can be charged simultaneously without any interference between bays. The microcomputer manages each bay's charge cycle separately.
What do the LED indicators on the Blackcell X4 Battery Charger mean?
Each bay has its own LED indicator that shows the current charge status. The LED changes colour or pattern as the battery moves through the charge cycle from empty to full. When the LED indicates a full charge, the battery can be safely removed. Refer to the included manual for the specific colour codes, as they indicate different stages of the CC/CV/dV charging process.
Is the Blackcell X4 Battery Charger safe to leave unattended?
The X4 includes overcharge protection, over-discharge protection, short-circuit protection, and reverse polarity detection. The microcomputer-controlled CC/CV/dV charging automatically terminates when batteries are full. These protections make it far safer than USB charging through a mod. As a best practice, always charge batteries on a non-flammable surface and avoid leaving them charging overnight when possible.
What is the difference between the Blackcell X2 and the Blackcell X4?
The primary difference is capacity. The X2 has 2 bays and the X4 has 4 bays. Both use the same microcomputer-controlled CC/CV/dV charging algorithm and the same safety protections. The X4 is the better choice for dual-battery mod users who need to charge married pairs while keeping a second set ready, or for households with multiple vapers sharing a single charger.
Should batteries be married when using the Blackcell X4 Battery Charger?
Battery marriage refers to using a matched pair of batteries exclusively together in a dual-battery mod. While the X4 charger itself does not require married batteries, any batteries used as a pair in a dual-battery mod should always be charged and discharged together. The X4 makes this easy by offering four bays: a married pair can go in bays one and two while another pair occupies bays three and four.
Why use a dedicated charger like the Blackcell X4 instead of USB charging?
Dedicated external chargers provide more precise voltage and current regulation, multi-phase charging algorithms, and better safety monitoring than the charging circuits built into most vape mods. They also charge batteries more evenly, which is especially important for dual-battery devices where uneven charging can cause performance issues and reduce battery lifespan. External charging is the standard recommendation from battery safety advocates in the vaping community.
