The fast charger Model DC1201 is specifically designed to charge only Makita battery cartridges. Never use it for other purposes or for other manufacturer's batteries.
When you charge a new battery cartridge or a battery cartridge which has not been used for a long period of time, it may not accept a full charge. This is a normal condition and does not indicate a problem. You can recharge the battery cartridge fully after discharging it completely and recharging a couple 
If you charge a battery cartridge from a 
If you wish to charge two battery cartridges, allow 15 minutes between chargings on the fast charger.
6831DW, 6831D specifications
The Makita 6831D and 6831DW are portable, high-performance cordless screwdrivers designed for efficient fastening tasks in a variety of applications. Combining advanced technologies and ergonomic design, these models have become popular choices among professionals and DIY enthusiasts alike.One of the standout features of the Makita 6831D and 6831DW is their powerful 14.4V motor, which delivers ample torque to ensure efficient screw driving. The adjustable torque settings allow users to select the appropriate force for different materials and applications, reducing the risk of overdriving screws and damaging workpieces.
Both models are equipped with a 1/4-inch hex chuck, which facilitates quick and easy bit changes. This design not only enhances user convenience but also accommodates a wide range of standard screwdriver bits. The compact and lightweight construction of these tools adds to their usability, making them ideal for extended periods of work without causing fatigue.
In terms of battery technology, the 6831D and 6831DW are powered by a reliable nickel-cadmium battery, providing a good balance between power density and cycle life. The batteries are easily replaceable, ensuring minimal downtime during projects. The built-in LED work light is another valuable feature that illuminates dark workspaces, allowing for increased visibility and accuracy when working in tight or poorly lit areas.
Additionally, both models boast solid build quality, featuring durable materials that withstand regular use in demanding environments. Their ergonomic grip design helps users maintain control and comfort while working, which is particularly beneficial during lengthy tasks.
When it comes to mobility and versatility, the Makita 6831D and 6831DW shine as they are lightweight and cordless, making them suitable for various job sites. The inclusion of a belt clip adds to the convenience, allowing users to keep the tool at hand for quick access when needed.
In conclusion, the Makita 6831D and 6831DW are excellent cordless screwdrivers that combine robust performance, user-friendly features, and a compact design, making them ideal for both professional tradesmen and casual users. Their commendable battery life, adjustable torque settings, and ergonomic construction ensure that users can tackle any fastening task efficiently and comfortably.