The other morning it failed to start, clicking noises only and dash lights. The battery looks old, and recently I had to add a significant amount of water to it. I've owned this car for only a year and a half. I took a voltage meter to the battery, and measured 10.3 volts without a load, left the voltage meter hooked up to the battery and turned the key to start it, and under load to the starter I measured fluctuating between 4-7 volts at the battery. Do I need a new battery? I'm fixed income and so I have to be careful and don't want to unnecessarily spend but it seems like the battery is bad. Your opinion?