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CH2A DC5V Universal Dual USB Battery Charger
The CH2A DC5V Universal Dual USB Battery Charger is a compact, intelligent charging solution designed for simultaneous charging of two rechargeable batteries with independent charging circuits and smart power management. Electronics technicians, field engineers, and IoT professionals rely on this charger for dependable battery maintenance across AA, AAA, and 18650 lithium-ion cells in remote monitoring systems, wireless sensor networks, and portable instrumentation. This dual-channel charger solves the critical problem of managing multiple battery types simultaneously while preventing overcharging, short circuits, and thermal runaway conditions through advanced IC-based protection circuitry.
Product Overview
The CH2A operates on a regulated DC5V input (typically via USB Type-A or micro-USB connector) and employs dual independent constant-current/constant-voltage (CC-CV) charging circuits to manage two battery slots simultaneously without interference. Each channel incorporates a dedicated charging controller IC that monitors cell voltage, charging current, and temperature in real-time, automatically switching from constant-current mode (typically 500-1000mA per channel) to constant-voltage mode as the battery approaches full charge. The charger's microprocessor-based intelligence prevents trickle charging beyond 4.2V for lithium cells and 1.5V for NiMH cells, extending battery lifespan and ensuring safety in unattended charging scenarios.
What distinguishes the CH2A from basic USB chargers is its multi-chemistry support and dual-slot independence. Unlike series charging designs where one faulty cell blocks both channels, the CH2A's parallel architecture allows one battery to charge while the other remains idle or charges at a different rate. The integrated thermal cutoff protection disables charging if cell temperature exceeds 55-60°C, critical for preventing thermal damage in high-ambient environments. LED indicators on each slot provide real-time charging status, displaying charging-in-progress, full-charge, and fault conditions independently for each battery.
Key Specifications
| Specification | Details |
| Product Type | Universal Dual-Channel Smart Battery Charger |
| Brand | CH2A (Generic OEM) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Input Voltage | DC 5V via USB Type-A or Micro-USB |
| Input Current | Maximum 2A (1A per channel typical) |
| Charging Slots | 2 independent channels |
| Compatible Battery Types | AA, AAA, 18650 Li-ion, 16340, 14500, NiMH, NiCd |
| Charging Current Per Channel | 500-1000mA (adjustable/fixed based on model) |
| Charging Mode | CC-CV (Constant Current to Constant Voltage) |
| Protection Features | Overcharge, Over-current, Thermal cutoff, Short-circuit, Polarity reverse |
| Operating Temperature | 0-45°C ambient |
| Dimensions | Approximately 100mm x 60mm x 30mm |
| Weight | Approximately 80-100 grams |
Key Features
- Dual Independent Charging Circuits: Each slot operates with isolated CC-CV control, allowing different battery types and states of charge to be managed simultaneously without cross-interference or voltage conflicts
- Multi-Chemistry Compatibility: Intelligently detects and charges AA, AAA, 18650 Li-ion, 16340, 14500 lithium cells, and NiMH/NiCd batteries with automatic voltage and current profile adjustment
- Smart Protection System: Integrated thermal monitoring, overcharge cutoff at 4.2V (Li-ion) or 1.5V (NiMH), over-current limiting, and reverse-polarity protection prevent battery damage and fire hazards
- Real-Time LED Status Indicators: Independent dual-color LEDs display charging-in-progress (red), full-charge (green), and error states (flashing) for each battery slot, eliminating guesswork in unattended charging
- USB-Powered Convenience: DC5V input via standard USB Type-A or Micro-USB connector enables charging from laptop USB ports, power banks, or wall adapters without proprietary power supplies
- Compact Form Factor: Portable design (100mm x 60mm x 30mm) fits in field kits, equipment bags, and laboratory benches without requiring dedicated power infrastructure
Applications and Use Cases
- IoT Field Deployment: Technicians maintaining remote sensor networks and wireless data loggers use the CH2A to charge backup 18650 batteries for uninterrupted operation during site visits, eliminating downtime in environmental monitoring systems
- Portable Instrumentation Support: Engineers working with multimeters, clamp meters, and handheld oscilloscopes rely on dual-slot charging to maintain AA/AAA battery stocks for continuous field measurements without returning to base stations
- Emergency Response and Disaster Recovery: First responders charge communication device batteries (walkie-talkies, GPS trackers) using laptop or vehicle USB power, maintaining operational readiness in areas without stable AC infrastructure
- Laboratory and R&D Environments: Electronics researchers and product developers use the CH2A for rapid battery cycling tests, battery characterization studies, and prototype power system validation with real-time thermal and voltage monitoring
- Renewable Energy Systems: Off-grid installations and solar-powered equipment use the charger to manage backup battery banks, charging from USB-output solar controllers or wind turbine regulators
- Photography and Videography: Content creators charging camera flashes, wireless microphone packs, and LED light batteries use dual-slot charging to maintain equipment availability during multi-hour shoots
How to Use
Begin by connecting the CH2A to a USB power source (5V minimum 1A recommended for optimal dual-channel charging speed). Connect the charger's USB input to a laptop, power bank, or USB wall adapter. Insert the first battery into Slot 1, observing correct polarity as marked inside the slot (positive terminal toward the spring contact). The red LED on Slot 1 will illuminate immediately, indicating charging has commenced. Insert the second battery into Slot 2 if dual charging is required. The charger automatically detects battery chemistry and capacity, adjusting charging current accordingly. Do not exceed 2A total input current when charging two high-capacity 18650 cells simultaneously, as this may reduce charging speed or trigger thermal protection.
Monitor the LED indicators during charging: a steady red light indicates active charging, while a green light signals full charge completion (typically 2-4 hours for AA cells, 4-6 hours for 18650 cells depending on capacity). If the LED flashes red or orange, remove the battery immediately and check for polarity errors, physical damage, or excessive corrosion on battery terminals. Never leave the charger unattended for more than 12 hours after the green LED appears, as extended trickle charging may degrade battery performance. After charging completes, remove batteries promptly to prevent overcharge stress. Store the charger in a cool, dry environment (0-45°C ambient) away from moisture and direct sunlight to preserve the charging controller IC's lifespan.
Frequently Asked Questions
Can the CH2A charge 18650 batteries and AA batteries simultaneously?
Yes, the CH2A's dual independent circuits allow mixed battery chemistry charging. You can insert an 18650 Li-ion cell in Slot 1 and an AA NiMH battery in Slot 2 simultaneously. The charger automatically detects each battery type and applies appropriate voltage thresholds (4.2V for Li-ion, 1.5V for NiMH) and current profiles independently. However, ensure total input current does not exceed 2A when charging high-capacity cells simultaneously, as this may reduce charging speed or trigger thermal protection.
What happens if I insert a battery with reversed polarity?
The CH2A incorporates reverse-polarity protection that prevents current flow if the positive and negative terminals are reversed. The LED will not illuminate, and no charging will occur. Simply remove the battery, reorient it correctly (positive terminal toward the spring contact), and reinsert. This protection prevents internal circuit damage and battery damage from incorrect insertion, a critical safety feature in field environments where technicians may work under time pressure or poor lighting.
How long does it take to fully charge a 18650 battery?
A typical 3000-3500mAh 18650 Li-ion battery charges in 4-6 hours at the CH2A's standard 500-1000mA charging current. Charging time depends on battery capacity, initial state of charge, and input USB power quality. If charging two 18650 cells simultaneously from a 1A USB power source, charging time may extend to 8-10 hours due to current sharing between slots. For faster charging, use a 2A USB power adapter and charge only one battery at a time.
Is the CH2A safe for overnight charging?
Yes, the CH2A is designed for unattended charging with automatic cutoff at full charge. Once the green LED illuminates, the charger switches to trickle-charge mode or terminates charging completely, depending on the controller IC version. However, best practice recommends removing batteries within 2-4 hours after the green LED appears to maximize battery lifespan and minimize stress on the charging circuit. Continuous overnight charging beyond 12 hours may slightly reduce battery cycle life over time.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EM
Buy CH2A DC5V Universal Dual USB Battery Charger Online in India
Purchase the CH2A DC5V Universal Dual USB Battery Charger online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.
CH2A DC5V Universal Dual USB Battery Charger
The CH2A DC5V Universal Dual USB Battery Charger is a compact, intelligent charging solution designed for simultaneous charging of two rechargeable batteries with independent charging circuits and smart power management. Electronics technicians, field engineers, and IoT professionals rely on this charger for dependable battery maintenance across AA, AAA, and 18650 lithium-ion cells in remote monitoring systems, wireless sensor networks, and portable instrumentation. This dual-channel charger solves the critical problem of managing multiple battery types simultaneously while preventing overcharging, short circuits, and thermal runaway conditions through advanced IC-based protection circuitry.
Product Overview
The CH2A operates on a regulated DC5V input (typically via USB Type-A or micro-USB connector) and employs dual independent constant-current/constant-voltage (CC-CV) charging circuits to manage two battery slots simultaneously without interference. Each channel incorporates a dedicated charging controller IC that monitors cell voltage, charging current, and temperature in real-time, automatically switching from constant-current mode (typically 500-1000mA per channel) to constant-voltage mode as the battery approaches full charge. The charger's microprocessor-based intelligence prevents trickle charging beyond 4.2V for lithium cells and 1.5V for NiMH cells, extending battery lifespan and ensuring safety in unattended charging scenarios.
What distinguishes the CH2A from basic USB chargers is its multi-chemistry support and dual-slot independence. Unlike series charging designs where one faulty cell blocks both channels, the CH2A's parallel architecture allows one battery to charge while the other remains idle or charges at a different rate. The integrated thermal cutoff protection disables charging if cell temperature exceeds 55-60°C, critical for preventing thermal damage in high-ambient environments. LED indicators on each slot provide real-time charging status, displaying charging-in-progress, full-charge, and fault conditions independently for each battery.
Key Specifications
| Specification | Details |
| Product Type | Universal Dual-Channel Smart Battery Charger |
| Brand | CH2A (Generic OEM) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Input Voltage | DC 5V via USB Type-A or Micro-USB |
| Input Current | Maximum 2A (1A per channel typical) |
| Charging Slots | 2 independent channels |
| Compatible Battery Types | AA, AAA, 18650 Li-ion, 16340, 14500, NiMH, NiCd |
| Charging Current Per Channel | 500-1000mA (adjustable/fixed based on model) |
| Charging Mode | CC-CV (Constant Current to Constant Voltage) |
| Protection Features | Overcharge, Over-current, Thermal cutoff, Short-circuit, Polarity reverse |
| Operating Temperature | 0-45°C ambient |
| Dimensions | Approximately 100mm x 60mm x 30mm |
| Weight | Approximately 80-100 grams |
Key Features
- Dual Independent Charging Circuits: Each slot operates with isolated CC-CV control, allowing different battery types and states of charge to be managed simultaneously without cross-interference or voltage conflicts
- Multi-Chemistry Compatibility: Intelligently detects and charges AA, AAA, 18650 Li-ion, 16340, 14500 lithium cells, and NiMH/NiCd batteries with automatic voltage and current profile adjustment
- Smart Protection System: Integrated thermal monitoring, overcharge cutoff at 4.2V (Li-ion) or 1.5V (NiMH), over-current limiting, and reverse-polarity protection prevent battery damage and fire hazards
- Real-Time LED Status Indicators: Independent dual-color LEDs display charging-in-progress (red), full-charge (green), and error states (flashing) for each battery slot, eliminating guesswork in unattended charging
- USB-Powered Convenience: DC5V input via standard USB Type-A or Micro-USB connector enables charging from laptop USB ports, power banks, or wall adapters without proprietary power supplies
- Compact Form Factor: Portable design (100mm x 60mm x 30mm) fits in field kits, equipment bags, and laboratory benches without requiring dedicated power infrastructure
Applications and Use Cases
- IoT Field Deployment: Technicians maintaining remote sensor networks and wireless data loggers use the CH2A to charge backup 18650 batteries for uninterrupted operation during site visits, eliminating downtime in environmental monitoring systems
- Portable Instrumentation Support: Engineers working with multimeters, clamp meters, and handheld oscilloscopes rely on dual-slot charging to maintain AA/AAA battery stocks for continuous field measurements without returning to base stations
- Emergency Response and Disaster Recovery: First responders charge communication device batteries (walkie-talkies, GPS trackers) using laptop or vehicle USB power, maintaining operational readiness in areas without stable AC infrastructure
- Laboratory and R&D Environments: Electronics researchers and product developers use the CH2A for rapid battery cycling tests, battery characterization studies, and prototype power system validation with real-time thermal and voltage monitoring
- Renewable Energy Systems: Off-grid installations and solar-powered equipment use the charger to manage backup battery banks, charging from USB-output solar controllers or wind turbine regulators
- Photography and Videography: Content creators charging camera flashes, wireless microphone packs, and LED light batteries use dual-slot charging to maintain equipment availability during multi-hour shoots
How to Use
Begin by connecting the CH2A to a USB power source (5V minimum 1A recommended for optimal dual-channel charging speed). Connect the charger's USB input to a laptop, power bank, or USB wall adapter. Insert the first battery into Slot 1, observing correct polarity as marked inside the slot (positive terminal toward the spring contact). The red LED on Slot 1 will illuminate immediately, indicating charging has commenced. Insert the second battery into Slot 2 if dual charging is required. The charger automatically detects battery chemistry and capacity, adjusting charging current accordingly. Do not exceed 2A total input current when charging two high-capacity 18650 cells simultaneously, as this may reduce charging speed or trigger thermal protection.
Monitor the LED indicators during charging: a steady red light indicates active charging, while a green light signals full charge completion (typically 2-4 hours for AA cells, 4-6 hours for 18650 cells depending on capacity). If the LED flashes red or orange, remove the battery immediately and check for polarity errors, physical damage, or excessive corrosion on battery terminals. Never leave the charger unattended for more than 12 hours after the green LED appears, as extended trickle charging may degrade battery performance. After charging completes, remove batteries promptly to prevent overcharge stress. Store the charger in a cool, dry environment (0-45°C ambient) away from moisture and direct sunlight to preserve the charging controller IC's lifespan.
Frequently Asked Questions
Can the CH2A charge 18650 batteries and AA batteries simultaneously?
Yes, the CH2A's dual independent circuits allow mixed battery chemistry charging. You can insert an 18650 Li-ion cell in Slot 1 and an AA NiMH battery in Slot 2 simultaneously. The charger automatically detects each battery type and applies appropriate voltage thresholds (4.2V for Li-ion, 1.5V for NiMH) and current profiles independently. However, ensure total input current does not exceed 2A when charging high-capacity cells simultaneously, as this may reduce charging speed or trigger thermal protection.
What happens if I insert a battery with reversed polarity?
The CH2A incorporates reverse-polarity protection that prevents current flow if the positive and negative terminals are reversed. The LED will not illuminate, and no charging will occur. Simply remove the battery, reorient it correctly (positive terminal toward the spring contact), and reinsert. This protection prevents internal circuit damage and battery damage from incorrect insertion, a critical safety feature in field environments where technicians may work under time pressure or poor lighting.
How long does it take to fully charge a 18650 battery?
A typical 3000-3500mAh 18650 Li-ion battery charges in 4-6 hours at the CH2A's standard 500-1000mA charging current. Charging time depends on battery capacity, initial state of charge, and input USB power quality. If charging two 18650 cells simultaneously from a 1A USB power source, charging time may extend to 8-10 hours due to current sharing between slots. For faster charging, use a 2A USB power adapter and charge only one battery at a time.
Is the CH2A safe for overnight charging?
Yes, the CH2A is designed for unattended charging with automatic cutoff at full charge. Once the green LED illuminates, the charger switches to trickle-charge mode or terminates charging completely, depending on the controller IC version. However, best practice recommends removing batteries within 2-4 hours after the green LED appears to maximize battery lifespan and minimize stress on the charging circuit. Continuous overnight charging beyond 12 hours may slightly reduce battery cycle life over time.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EM
Buy CH2A DC5V Universal Dual USB Battery Charger Online in India
Purchase the CH2A DC5V Universal Dual USB Battery Charger online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.