It is important to remember if you are looking for an equivalent for the Yuasa NPW45-12 Battery you must choose a high rate discharge equivalent to avoid any loss of performance.
You can use any of the following high rate batteries
Why is this important to only use these alternatives, these batteries have a high current discharge much higher than standard AGM batteries which some applications require to function correctly. Unfortunately choosing a cheaper battery with lower discharge rates will provide lower than expected performance.