US Patent 10181590 Rechargeable battery system for replacement of lead-acid battery

A battery system for use with outdoor power equipment includes a base including a positive terminal, a negative terminal, and a battery receptacle electrically coupled to the positive terminal and the negative terminal, wherein the positive terminal and the negative terminal are spaced apart by a distance substantially the same as a standard distance between terminals of a standard lead-acid battery, and a lithium-ion battery removably attached to the battery receptacle, wherein when attached, the lithium-ion battery is electrically coupled to the positive terminal and the negative terminal via the battery receptacle.