Package invldues: 12V 5000mAh battery pack*1, 12V charger*1, DC5521 male connector cable*1, cable connector*1. With BMS: Built-in protection board, to prevent battery from over-charge, over-discharge, over-voltage and short-circuit. Each battery pack is build with premium grade A batteries to supply your devices powerful energy. Battery Compatible with: Bluetooth devices, CD Players, MD players, Portable DVDs, MP3 Players, LED Strip, Electronic Piano, Router, Small Bluetooth Amp, 12V turn signals, 12V Pump. Long life: this 12V battery pack is build with lithium-ion battery, no memory effect, can charge-discharge over 1000cycles. We provide 12 months product guarranty. Please contact with us for customer support if you have any question about the product. Seasider 12V 5000mAh Li-ion Battery Pack, Bare Leads Wire Lithium Replacement Battery with 12V Charger for 12 Volt Device RC Car, Robot, DIY, LED Light Strip