Features: This battery maintainer is specially designed for lead-acid batteries used in engines, and adopts three-stage intelligent control mode of constant current fast charging, current limiting and trickle floating charging. It can be charged for a long time without damage to the battery, and can maintain the fully charged state of the battery and ensures the service life of the battery. This battery maintainer can be used in parallel with the engine charging generator, and it is not necessary to disconnect the maintainer during the engine operation. The metal shell is adopted, which have good heat dissipation effect and strong antiinterference ability. Adopting advanced switching power supply type result, wide alternating current input voltages range. Specifications: Component:Metal Size:Approx.8x5.8cm/3.15x2.28inch Color:Black Model: BCC3A Three-stage intelligent charging, automatically maintain the battery power; With short circuit, anti-reverse protection function; With fine-tuning function of charging voltages; With LED condition display; Package Includes: 1pcs Battery Maintainer note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.