Compatibility for BL1890 Battery Systems Specifically designed for use with BL1890 battery systems and compatible models such as BL186015. This battery case kit integrates seamlessly with original chargers, providing reliable performance for your 18V 9.0Ah power tool batteries. Advanced Safety Protection Features a threestage overcurrent protection system and a PCB board that safeguard against and low voltage extremes, overcharge, overdischarge, and excessive current. Prevents potential damage and extends battery life. Performance Parameters The protection circuit board allows external adjustment of current and overcurrent delay settings. Enables tailoring of the battery operation to specific requirements and conditions for optimized usage. Construction and Design Made from ABS flame retardant material for lasting durability and enhanced safety during assembly and use. Compact design ensures it fits as a replacement housing for DIY projects. Use Scenarios Build a protected, compact 18V battery pack for BL1890 compatible tools using your existing charger. Create a DIY replacement housing that works with BL186015 chargers for efficient tool battery management. Integrate into custom tool builds that require a safe, adjustable protection circuit and a durable ABS housing.