OPTIMA YellowTop YT R-3.7 12V 48Ah 660A R+

• Brand: OPTIMA
• Series: YellowTop
• Model: YT R-3.7
• Type: Deep cycle
• Voltage: 12 V
• Capacity: 48 Ah
• Cold cranking (CCA): 660 A
• Polarity: R+
• Terminals: Standard terminal
• Dimensions (L×W×H): 237 × 171 × 197 mm
• Weight: 17 kg
• Maintenance-free
• Breather on the top
• Intended use: Marine and recreation

About this battery
OPTIMA YellowTop is a dual-purpose (deep-cycle + starting) battery — strong engine starting plus the ability to be drained flat and recharged over and over. Ideal for heavy electrical accessories (audio, winch, lighting), start-stop use, or vehicles that sit unused for long periods. Its AGM SpiralCell construction makes it maintenance-free, spill-proof and vibration-resistant.

Key terms

• CCA (Cold Cranking Amps) — cold-start power; higher means a stronger start in the cold
• Ah — capacity / energy reserve
• L+ / R+ — terminal polarity (which side the positive post is on); important for correct fitment