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  4. 4V 0.5Ah Sealed Lead Acid (SLA) Rechargeable Battery for Mini LED Torches and DIY Projects
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4V 0.5Ah Sealed Lead Acid (SLA) Rechargeable Battery for Mini LED Torches and DIY Projects

4V 0.5Ah Sealed Lead Acid (SLA) Rechargeable Battery for Mini LED Torches and DIY Projects

ComponentSpecification
ChemistrySealed Lead Acid (SLA)
Nominal Voltage4.0V
Capacity0.5Ah (500mAh)
Full Charge Voltage4.5V – 4.6V
Terminal TypeSolder Tabs / Flat Lead Connectors
Housing MaterialImpact-Resistant ABS Plastic
                                 Price

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₹ 33.90 ₹ 33.90
(Tax included)

Barcode: 6444

Product Description The 4V 0.5Ah Sealed Lead Acid battery is an ultra-compact, maintenance-free power source designed for small-scale portable electronics. Offering 500mAh of capacity, this battery is the standard choice for slim rechargeable LED flashlights, mini emergency lamps, and small handheld electronic testers. Its valve-regulated, spill-proof construction ensures safe operation in any position, providing a rugged and cost-effective alternative to small Ni-Cd packs in compact DIY enclosures.

Key Features

  • Ultra-Compact Footprint: Specifically engineered for "pocket-sized" electronics where space is extremely restricted.

  • Maintenance-Free: Completely sealed design requires no electrolyte top-ups throughout its operational life.

  • Stable 4V Output: Maintains a steady voltage discharge, making it ideal for driving white LEDs (3.0V-3.4V) with high efficiency.

  • Rugged ABS Case: Built to withstand the vibrations and minor impacts common in portable handheld tools.

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

Technical Details

  • Dimensions: Approx. 20mm x 22mm x 50mm (Standard 4V 0.5Ah footprint)

  • Standard Charge Current: 50mA (0.1C)

  • Max Charge Voltage: 4.8V

  • Cycle Life: 200–300 Charge/Discharge cycles

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

  • Weight: Approx. 40g to 60g

Prototyping and Engineering Tips from Robogears

  • Precision Charging: To maintain the longevity of this small cell, avoid "fast charging." A constant current of 50mA is the recommended "sweet spot." For a simple DIY charger, use an LM317 regulator circuit set to a limit of 4.6V.

  • LED Efficiency: This battery is perfect for driving 1 to 3 high-brightness 5mm LEDs. Since the battery voltage (4V) is very close to the LED forward voltage (~3.2V), you only need a small $22\Omega$ to $47\Omega$ resistor to limit current, ensuring very little power is wasted as heat.

  • Deep Discharge Warning: Small SLA batteries are sensitive to over-discharge. If the voltage drops below 3.5V, the internal chemistry can begin to degrade. Always charge the battery immediately after use to prevent "sulfation" of the lead plates.

  • Soldering Advice: When soldering wires to the tabs, use a pre-tinned wire and a hot iron. Complete the joint in under 2 seconds to prevent heat from traveling into the plastic casing and compromising the internal seals.

Package Includes

  • 1 x 4V 0.5Ah 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 product contains lead; please dispose of it responsibly at an authorized e-waste or battery recycling center.

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