WBDP GS640 belongs to our standard VRLA sealed lead-acid battery series. With dimensions 70*47*100mm and net weight 0.67kg, this compact 6V 4Ah maintenance-free battery adopts advanced absorption glass mat technology. It delivers stable, reliable standby & cyclic power for a wide range of small equipment, widely used in alarm systems, lighting, electric bikes, marine vessels, small UPS, automotive & auxiliary bus power supply.

• Model: GS640
• Rated Voltage & Capacity: 6V 4Ah (20hr rate)
• Dimension: 70 * 47 * 100 mm
• Net Weight: 0.67 kg
• Type: Valve Regulated Sealed Lead Acid Battery (VRLA AGM)
• Constant Voltage Charging (25℃):
  Cycle use: 7.20–7.50V
  Standby use: 6.75–6.90V
• Max Initial Charging Current: ≤1.2A
• Certifications: CE, Lead recycling compliant

1. Sealed Maintenance-Free DesignNo need regular water refilling; safe horizontal or vertical installation, low risk of acid leakage.
2. Compact & Lightweight StructureSmall footprint and light weight, easy for cabinet mounting, portable equipment integration.
3. Stable Discharge PerformanceFlat discharge curve, strong shock resistance, suitable for frequent short-time cyclic loads and long-term floating standby.
4. Wide Temperature AdaptabilityWorks reliably for indoor & mild outdoor scenarios, ideal for security equipment and portable electrical devices.
5. Low Self-Discharge RateLong shelf life, suitable for seasonal use of small electric vehicles and backup lighting systems.
6. Universal Interchangeable SizeStandard industry dimensions, directly replaceable with mainstream 6V4Ah batteries for aftermarket maintenance.

Security alarm systems, emergency lighting, small UPS power supply, electric bicycles, toy vehicles, marine & boat auxiliary power, car & bus auxiliary backup power, portable instruments, garden equipment, solar small lighting systems.