Lithium batteries are rechargeable batteries that use graphite or other carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. It is a kind of battery that uses lithium metal or lithium alloy as positive/negative electrode material and uses a non-aqueous electrolyte solution.
Cordless tools are in no way inferior to their mains-powered counterparts. Each has its own benefits which we will explain below. Please note that, in most cases, it isn’t until you reach these newer power tool batteries that you will be able to achieve the same power output as the corded equivalent, so like anything, they come at a cost.
They are ‘high-end’ batteries in terms of capacity vs. mass, they have no memory effect, can be discharged with relatively high currents, and last long. They are one of the most expensive types of batteries used in cordless vacuum cleaners.
The energy density of a nickel-metal hydride battery as a power tool battery is not as high as that of a lithium battery. Therefore, in the same battery space, the capacity of the nickel-hydrogen battery is smaller than that of a lithium battery, but the consistency of the nickel-hydrogen battery is higher than that of a lithium battery.