Ryobi P108 drill batteries readily available where you live. It is important to use identical batteries in your pack. They must all have the same voltage and current characteristics. Calculate how many batteries you need by dividing 12 by the voltage of the batteries. For example, use eight 1.5-volt batteries because 12 / 1.5 = 8, or two 6-volt batteries because 12 / 6 = 2. Link together the batteries, connecting the positive terminal of the first battery to the negative terminal of the second. Link all the batteries in the same way, always joining opposite polarity terminals. You can stack cylindrical batteries, such as the A, C and D series batteries, on top of each other in a plastic or cardboard tube, or wrap them together in sticking tape. When using larger batteries with spring terminals, such as rectangular 6-volt batteries, join them with short lengths of wire. Run a wire from the unused terminals at each end of the line of tool batteries. The voltage between the two wires is 12 volts. ">All batteries produce around 2 volts, sometimes a little more or less, depending on the type of battery and the chemicals it uses. To make Makita BL1013 batteries with higher voltages, manufacturers link identical batteries in a series circuit. In this way the voltages of the individual batteries are added together, so six 2-volt battery cells become one 12-volt battery (6 x 2 = 12). You can use the same electrical technique to create your own battery packs at home. Doing so requires basic math and no electronic skills. Select the type of batteries from which to create a 12-volt battery pack. You might consider their size, shape or amp/hour capacity to be important, or you may just choose the Hitachi BCL1815 drill batteries readily available where you live. It is important to use identical batteries in your pack. They must all have the same voltage and current characteristics. Calculate how many batteries you need by dividing 12 by the voltage of the batteries. For example, use eight 1.5-volt batteries because 12 / 1.5 = 8, or two 6-volt batteries because 12 / 6 = 2. Link together the batteries, connecting the positive terminal of the first battery to the negative terminal of the second. Link all the batteries in the same way, always joining opposite polarity terminals. You can stack cylindrical batteries, such as the A, C and D series batteries, on top of each other in a plastic or cardboard tube, or wrap them together in sticking tape. When using larger batteries with spring terminals, such as rectangular 6-volt batteries, join them with short lengths of wire. Run a wire from the unused terminals at each end of the line of batteries. The voltage between the two wires is 12 volts. MAKITA UH3000D batteries with higher voltages, manufacturers link identical batteries in a series circuit. In this way the voltages of the individual batteries are added together, so six 2-volt battery cells become one 12-volt battery (6 x 2 = 12). You can use the same electrical technique to create your own battery packs at home. Doing so requires basic math and no electronic skills. Although rechargeable batteries used to be unusual, expensive and unreliable, they have come down in price and greatly increased in reliability. They are used exclusively in computers, cell phones and many other high-tech electronics, and are beginning to replace disposable batteries in other applications. Modern rechargeable batteries have many advantages over conventional disposable batteries. They last longer, cost less over their lifetime than replacing a series of disposables, and are better for the environment. Make sure the battery pack is one that you can charge. If it is a standard battery--such as a AA, D or 9-volt battery--that can be recharged, the word "rechargeable" will appear somewhere on it. If it is a laptop battery, camcorder battery or other specialized battery pack, it will not say "rechargeable," simply because those types of specialized batteries are always rechargeable. Determine if the batteries can be recharged by simply plugging in the device they are used for. Cellphones, laptops and some camcorders automatically recharge their batteries when they are plugged in, which obviates the need for a separate charger. If possible, recharge the battery before it runs out completely. Remove it from the circuit and plug it into the charger when it is at 1/4 power. Set the correct voltage on the charger. Using too high a voltage can damage a battery, and using too low a voltage can result in incomplete charging. Most battery packs will have their voltage marked on them. Check the pack frequently to make sure it is not overheating the first time you use it. If the charger is defective or improperly set up, it can overheat the cordless drill battery and potentially cause an explosion.
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