With a harsh quality check never worry about cracking or catching on fire.
Note: IF you car s battery is good and you don t do the step<2.1> it may cause battery damage!! If you car s battery is good and you just want to test this emergency battery. Package Include: - 1x Jump starter battery - 1x Three-in-one USB charge adapter - 1x 12V Storage battery wire clip - 1x AC Home Power adapter (Plug suit your location) - 1x Car charger adapter - 1x Tool Bag 20000mAh Car Jump Starter Auto Battery Booster Power Pack with Clamp Portable Truck Accessories Black+White Interior/Exterior: Exterior Included Items: No Dimensions: 2.2> Connect red clamp to positive wire black clamp to negative wire.