Inquiry about Li-ion Polymer Battery Pack with Integrated Protection

I am developing a compact consumer electronic product and require a Li-ion battery pack with integrated protection (PCM/BMS) for initial production. Electrical requirements include: - Nominal voltage: 3.7V Li-ion - Capacity: approximately 650mAh - Maximum discharge: up to 3A pulse (short duration) - Charging current: 100–250mA Mechanical constraints are critical: - Maximum length: 50mm - Maximum width: 30mm - Thickness: flexible but not excessively bulky - Preferred format: flat Li-ion polymer (not cylindrical) Please provide detailed technical specifications such as maximum continuous discharge current, pulse discharge details, protection circuit specifications (overcharge, over-discharge, overcurrent, short-circuit), internal resistance, cycle life, and certifications.