Yes, you can replace a 12-volt 5-ah battery with a 12-volt 7-ah battery. The higher amp-hour (ah) rating means the 7-ah battery can provide more power for a longer period of time compared to the 5-ah battery. However, it's important to ensure that the physical dimensions of the 7-ah battery will fit in the same space as the 5-ah battery and that the electrical connections are compatible. **

No, a 12-volt battery will not charge with less than 12 volts. In order to charge a 12-volt battery, the charging voltage needs to be higher than the battery's voltage. Typically, a 12-volt battery will require a charging voltage of around 13-14 volts in order to properly charge. If the charging voltage is less than the battery's voltage, the battery will not charge and may even discharge further. **

The 12-volt battery is likely smoking due to overcharging or a short circuit. Overcharging can cause the battery to heat up and release smoke as a result of the excess energy being converted into heat. A short circuit can also lead to excessive current flow through the battery, causing it to overheat and smoke. In either case, it is important to immediately disconnect the battery and seek professional help to prevent any further damage or potential safety hazards. **

Without knowing the specific condition of the 12-volt battery, it is difficult to determine if it is salvageable. If the battery is simply discharged or has minor issues, it may be possible to recharge or repair it. However, if the battery is severely damaged or has been drained for an extended period of time, it may be beyond salvageable and need to be replaced. It is recommended to have a professional inspect the battery to determine its salvageability. **

Yes, two 12-volt motors can be connected to a 12-volt battery. Each motor will receive 12 volts of power from the battery. However, connecting multiple motors to a single battery may affect the overall performance and longevity of the battery, as the motors will draw more current from the battery. It is important to ensure that the battery can supply enough current to power both motors simultaneously without being overloaded. **

Yes, the 12-volt battery should only be charged with 12 volts. Charging a 12-volt battery with a higher voltage can lead to overcharging, which can damage the battery and reduce its lifespan. It is important to use a charger specifically designed for 12-volt batteries to ensure safe and proper charging. Overcharging can also lead to the release of harmful gases and potential safety hazards. Therefore, it is crucial to follow the manufacturer's recommendations for charging the 12-volt battery. **

No, a 12-volt car battery cannot charge an 18-volt Makita battery directly. The voltage of the car battery is lower than the voltage required to charge the Makita battery. Using a lower voltage power source can damage the Makita battery and may not charge it properly. It is important to use the correct voltage charger specified by the manufacturer to charge the Makita battery safely and effectively. **

The iPhone 12 features a built-in rechargeable lithium-ion battery, which offers up to 17 hours of video playback and up to 65 hours of audio playback. It also supports fast charging, allowing the device to reach up to 50% charge in around 30 minutes with a 20W adapter or higher. Additionally, the iPhone 12 is compatible with MagSafe wireless charging, which provides a convenient and efficient way to charge the device. Overall, the battery of the iPhone 12 offers reliable performance and various charging options to suit different needs. **