The Ryobi 18v One+ System Battery Charger Model P110 is designed for Nickel-Cadmium (NiCd) batteries in the Ryobi 18V lineup. This black charger is suitable for use with Ryobi power tool batteries and is specifically tested to ensure compatibility with NiCD batteries. The charger is part of the Home & Garden and Tools & Workshop Equipment categories, offering a convenient power tool accessory for users looking to keep their Ryobi batteries charged and ready for use.