The Envie ECR‑31 Rapide Ultra Fast Charger is a high-speed smart charger supporting AA and AAA Ni‑MH or Ni‑Cd batteries. It can charge 1 to 4 cells simultaneously with intelligent IC control and -V auto cut‑off, transitioning automatically to trickle charge to avoid overcharging. An easy‑to‑read LCD display indicates “CHG” when batteries are inserted, and flashes “ERROR” along with a battery icon if a non‑rechargeable, short‑circuited, or defective cell is detected. The design is BIS‑certified for quality and safety, offering over‑temperature protection (auto cut‑off above ~60 °C), short‑circuit detection, and portable desktop form factor—perfect for fast, reliable charging.