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  4. 4V 2Ah Sealed Lead Acid (SLA) Rechargeable Battery for Flashlights and DIY Electronics
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4V 2Ah Sealed Lead Acid (SLA) Rechargeable Battery for Flashlights and DIY Electronics

4V 2Ah Sealed Lead Acid (SLA) Rechargeable Battery for Flashlights and DIY Electronics

ComponentSpecification
ChemistrySealed Lead Acid (SLA)
Nominal Voltage4.0V
Capacity2.0Ah (2000mAh)
Full Charge Voltage~4.5V to 4.8V
Cycle Life200–400 Cycles
Terminal TypeSolder Tabs / Spring Contacts
                                 Price

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बारकोड: 6647

Product Description

The 4V 2Ah Sealed Lead Acid battery is a specialized, compact energy source primarily used in portable rechargeable LED flashlights, emergency lights, and small electronic handheld devices. Unlike standard 6V or 12V SLA batteries, this 4V variant is designed for low-voltage circuits where a lightweight yet steady power source is required. Built with a maintenance-free, spill-proof design, it offers a reliable alternative to nickel-cadmium packs, providing consistent current delivery for high-brightness LEDs and small DC motors.

Key Features

  • Maintenance-Free: No need to add water or check electrolyte levels; sealed for safe operation in any orientation.

  • Stable 4V Rail: Provides a consistent voltage that is ideal for white LEDs which typically have a forward voltage ($V_f$) of 3.0V to 3.4V.

  • High Surge Capacity: Capable of delivering the high initial current needed to start small motors or power high-intensity bulbs.

  • Robust ABS Casing: Durable outer shell protects the internal lead plates from vibration and impact.

  • Low Self-Discharge: Retains its charge effectively during storage compared to older battery technologies.

Technical Details

  • Dimensions: Approx. 35mm x 22mm x 90mm (Varies by manufacturer)

  • Standard Charge Current: 200mA (0.1C)

  • Max Charge Voltage: 4.8V

  • Discharge Cut-off: 3.5V

  • Weight: Approx. 150g to 200g

  • Operating Temperature: -10°C to +50°C

Prototyping and Engineering Tips from Robogears

  • Direct LED Powering: Because a 4V battery sits close to the forward voltage of many high-power LEDs, you can often drive LEDs using only a small current-limiting resistor ($1\Omega$ to $10\Omega$), making it a very efficient choice for custom lighting projects.

  • Charging Caution: These batteries are sensitive to overcharging. Do not use a standard 5V USB charger directly. Use a dedicated 4V SLA charging circuit or a regulated power supply limited to 4.5V–4.7V to prevent the battery from swelling or venting.

  • The "Dead Battery" Fix: If your 4V battery has been sitting for months and won't charge, it may have "sulfated." Try charging it at a very low current (e.g., 50mA) for 24 hours to see if the chemistry reacts. If it reads 0V after a day of charging, the internal plates are likely damaged.

  • Solder with Care: If your battery has solder tabs, be quick with the soldering iron. Applying heat for more than 3–5 seconds can melt the plastic casing around the terminal and cause internal leaks.

Package Includes

  • 1 x 4V 2Ah Sealed Lead Acid (SLA) Rechargeable Battery

Disclaimer

Images are for reference; actual dimensions or casing color may vary by batch. Specifications subject to change by manufacturer. This is a lead-based product; please recycle at an authorized collection center.

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