Key Features
- Universal AA/AAA Smart Charging: Supports all rechargeable AA and AAA batteries in 1.5V lithium-ion and 1.2V Ni-MH chemistry across four independent slots, with automatic battery type detection and optimal charging strategy selection for each cell.
- HD LCD Display: Built-in HD LCD screen visualizes charging and discharging status in real time with battery level bar indicators, providing clear and intuitive charge monitoring for all four slots simultaneously.
- Multi-Stage NiMH Refresh Mode: Dual-mode refresh system — Quick Refresh and Smart Deep Refresh — eliminates memory effect, restores effective capacity, and extends battery service life for 1.2V Ni-MH cells.
- Micro-Current Activation for Over-Discharged Batteries: Advanced micro-current activation at 200mA revives deeply over-discharged batteries at higher recovery rates than standard activation methods, recovering cells that conventional chargers may fail to detect.
- Seven Built-In Safety Protections: Comprehensive protection suite including over-discharged battery activation, auto-stop after full charge, reverse polarity protection, over-current protection, over-voltage protection, over-charge protection, and short-circuit protection.
Overview
The XTAR L4 Pro is a smart four-slot AA/AAA battery charger engineered for both 1.5V lithium-ion and 1.2V Ni-MH rechargeable batteries. Building on the capability of the standard L4, the L4 Pro adds an HD LCD display for real-time charge status visualization, a multi-stage NiMH refresh system for capacity restoration and memory effect elimination, and micro-current activation at 200mA for improved recovery of deeply over-discharged batteries. Powered via USB-C at DC 5V 2A, the L4 Pro delivers independent 0.5A charging per slot with CVSA technology and four additional full-charge detection methods to ensure complete, accurate charge termination with minimal heat generation. The unit is constructed with fireproof ABS+PC/V0 housing, weighs 87g, and is compact enough for home and travel use. Compatibility extends across a wide range of 1.2V NiMH and 1.5V li-ion brands including XTAR, Eneloop, Energizer, EBL, Duracell, and others. Package includes the L4 Pro charger and a USB-C cable.
Applications / Uses
- Charging XTAR 1.5V li-ion AA and AAA rechargeable batteries and compatible third-party 1.5V li-ion AA/AAA cells
- Charging and refreshing 1.2V Ni-MH AA and AAA batteries from XTAR, Eneloop, Energizer, EBL, Duracell, and other compatible brands
- Restoring degraded NiMH batteries via multi-stage Quick Refresh or Smart Deep Refresh to recover usable capacity and extend service life
- Recovering deeply over-discharged AA and AAA batteries using micro-current activation that standard chargers cannot perform
- Home, office, and travel use powered by any standard USB-C 5V 2A power source
Specifications
| Brand: | XTAR |
| Model: | L4 Pro |
| Compatible Battery Size: | AA / AAA |
| Compatible Battery Type: | 1.5V Li-ion and 1.2V Ni-MH |
| Number of Slots: | 4 |
| Power Input: | DC 5V 2A, USB-C port |
| Charging Current: | 0.5A x 1 / 0.5A x 4 (independent per slot) |
| Activation Current: | 200+/-50mA |
| Charging Cutoff (Li-ion): | N/A, 100mA or less |
| Charging Cutoff (NiMH): | 1.45+/-0.1V, N/A |
| Display: | HD LCD with battery level bar indicators |
| NiMH Refresh Mode: | Quick Refresh and Smart Deep Refresh |
| Over-Discharged Battery Recovery: | Yes — micro-current activation |
| Housing Material: | Fireproof ABS+PC/V0 |
| Safety Features: | Over-discharged battery activation, auto-stop after full charge, reverse polarity, over-current, over-voltage, over-charge, short-circuit protection |
| Operating Temperature: | 0°C to 40°C |
| Storage Temperature: | -10°C to 60°C |
| Dimensions: | 80mm (L) x 102mm (W) x 27.5mm (H) |
| Weight: | 87g |
| User Manual: | View User Manual |
⚠ Important Safety Warnings
Improper use of a battery charger can result in overcharging, short circuits, or damage to the battery, causing FIRE, EXPLOSION, or ELECTRICAL SHOCK. Users must follow all safety guidelines to ensure proper operation. Click here to review the full safety guidelines.
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Device Compatibility:
- Use the charger only for compatible battery types and sizes as specified by the charger manufacturer. Ensure the charger is appropriate for the battery chemistry, size, and protection status (e.g., unprotected or protected cells).
- Do not charge non-rechargeable batteries (e.g., alkaline or primary cells).
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Proper Use:
- Only charge batteries in a fireproof or non-flammable area. Avoid charging on beds, couches, or other flammable surfaces.
- Do not force a battery into the charger slot if it does not fit properly. This can damage the charger or battery and may result in unsafe charging conditions.
- Inspect batteries before charging: Do not charge if the battery casing, wrapper, or terminals are damaged, dented, leaking, or bulging.
- Never leave batteries unattended while charging. Monitor the charging process, and unplug the charger when charging is complete.
- Avoid exposing the charger to liquids, high heat, or direct sunlight.
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Inspection:
- Do not use the charger if the power cord, plug, or device is damaged.
- Inspect both the charger and the battery for any signs of damage before use.
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Storage & Handling:
- Keep the charger away from children and pets.
- When not in use, unplug the charger and store it in a cool, dry place.
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Prohibited Activities:
- Do not modify or disassemble the charger.
- Do not attempt to repair a damaged charger—replace it with a new one.
- Avoid using extension cords or adapters that exceed the manufacturer’s recommendations.
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Emergency Response:
- If the charger or battery emits smoke, sparks, or a burning smell, disconnect the power immediately and move the battery and charger to a safe area.
- In case of fire, use a Class D fire extinguisher or sand to extinguish the flames.
Disclaimer
18650Battery.com is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Battery chargers must only be used with compatible battery types and operated in accordance with manufacturer instructions. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to their customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.