Electric off-road motorcycles don't have an engine because they use an electric motor instead of a gas engine. It's battery life, which depends on battery type and usage. There are two types of batteries for electric off-road motorcycles that are common in the market at present: lead-acid batteries and lithium batteries.
Lead-acid batteries have a relatively short lifespan, usually between one and two years, and need to be replaced periodically. Lithium-ion batteries have a longer lifespan and can generally be used for about 3 to 5 years. Of course, the life of the battery will also be affected by factors such as battery quality, charging method, charging times, storage temperature, and discharge depth.