As a large language model, I do not have the ability to create physical objects like a forklift charger. However, I can certainly provide some information and guidance on what goes into designing and building your own forklift charger.

First and foremost, it's important to understand the basic principles behind how a forklift charger works. Essentially, a forklift charger takes in AC power from an electrical outlet and converts it into DC power that can be used to charge the battery of a forklift. The charger needs to be able to regulate the voltage and current going into the battery, to ensure that it charges safely and efficiently.

To design your own forklift charger, you'll need to start by selecting the appropriate components. This will typically include a transformer to step down the voltage from the AC outlet, a rectifier to convert the AC power to DC, and a controller to regulate the charging process. You'll also need to choose the appropriate wiring and connectors to connect the charger to the forklift battery.

When selecting components, it's important to choose high-quality parts that are designed for the power levels and voltage requirements of your forklift. You'll also need to make sure that the components are compatible with each other and that they can handle the load of charging the battery.

Once you have selected your components, you'll need to assemble them into a circuit. This can be done on a printed circuit board (PCB), or you can wire the components together manually. You'll need to make sure that the circuit is designed to provide the appropriate voltage and current levels for charging your forklift battery.

Finally, you'll need to test and tune your charger to ensure that it's working correctly. This will typically involve measuring the voltage and current going into the battery, and adjusting the charging parameters as needed to ensure that the battery is charging safely and efficiently.

Overall, designing and building your own forklift charger can be a challenging but rewarding project. By following these basic principles and selecting high-quality components, you can create a charger that is tailored to the specific needs of your forklift and that can help extend the life of your battery.