Do you need to replace both batteries on 04 f250?

In most cases, it is recommended to replace both batteries on a 2004 F250 at the same time. This is because batteries age and wear out together, and if one battery fails, the other is likely to follow soon after. However, there are some cases where it may not be necessary to replace both batteries. For example, if one battery is significantly damaged or has a lower capacity than the other, it may be possible to replace just the bad battery. If you are unsure about whether or not you need to replace both batteries, it is always best to consult with a qualified mechanic who can inspect your vehicle's electrical system and make a recommendation.