The TJ3LD is a charger for rechargeable batteries manufactured by Tryton. It is capable of charging a variety of common battery types, including NiMH, NiCd, Li-Ion, and NiZn batteries. The charger is designed with safety and durability in mind, as it offers both reverse-polarity protection and overcurrent protection. It also has a low-voltage shutoff to help prevent excess power usage. Additionally, the charger has a built-in LED display, which lets you know the charging status of the battery. The charge time is adjustable, allowing you to choose how long the battery should be charged.