To ensure your battery's longevity, you should: keep the area where cables are connected I to the positive and negative poles clean have it checked by a mechanic weekly recharge it at night make sure you are changing the battery fluid

## Step 1<br />The problem is about the maintenance of a battery, which is a common household item. The question asks for the best way to ensure the longevity of the battery. <br /><br />## Step 2<br />The options provided are:<br />- Keep the area where cables are connected clean<br />- Have it checked by a mechanic weekly<br />- Recharge it at night<br />- Make sure you are changing the battery fluid<br /><br />## Step 3<br />Among these options, the most effective way to ensure the longevity of a battery is to keep the area where the cables are connected clean. This is because dirt and corrosion can impede the flow of electricity, which can lead to the battery dying prematurely.<br /><br />## Step 4<br />The other options, such as having the battery checked by a mechanic weekly, recharging it at night, and changing the battery fluid, are not as effective. Regular maintenance by a mechanic is not necessary for a battery, recharging at night is not a standard practice, and batteries do not have a fluid that needs to be changed.