Can a 75d23 car battery be replaced with a 55d23?
3 Answers
It cannot be replaced; do not change the battery arbitrarily. Extended information about car batteries is as follows: Definition: The normal service life varies from 1 to 8 years, largely depending on the condition of the vehicle. If the vehicle's alternator charges normally and there is no electrical leakage or grounding issue, the battery can generally last more than 3 years. Working principle: It uses lead plates filled with spongy lead as the negative electrode, lead plates filled with lead dioxide as the positive electrode, and 22-28% dilute sulfuric acid as the electrolyte. During charging, electrical energy is converted into chemical energy, and during discharging, chemical energy is converted back into electrical energy. When the battery discharges, metallic lead acts as the negative electrode, undergoing oxidation and being converted into lead sulfate; lead dioxide acts as the positive electrode, undergoing reduction and being converted into lead sulfate.
I've handled quite a few similar cases. In theory, replacing a 75D23 car battery with a 55D23 model should work since they share the same physical dimensions, but there's a 20Ah capacity difference - the 55Ah is significantly smaller. It's like trying to supply a large engine with a small bucket of water. During cold starts or when the starter motor demands high current, you might experience failure to ignite. I've even seen cases where owners opted for cheaper smaller batteries, only to encounter unstable power supply when running AC or audio systems, causing severe idle vibrations. Over time, this accelerates battery degradation, leading to costlier repairs. My advice: stick with the original 75D23 specification. Don't invite trouble by trying to save a few bucks - safe driving is paramount. Always check your manual or consult a mechanic to confirm compatibility.
Last year, my car battery died, and since it was out of stock, I tried replacing the 75D23 with a 55D23. For the first few days, the car started smoothly, and I thought there was no issue. However, when winter came, it became embarrassing—I had to try several times in the morning to get the car started. The insufficient cold cranking current almost made me late for work. Later, the mechanic explained that the 55D23 has a smaller capacity and weaker power supply, making it prone to draining and affecting the car lights and ECU. After I promptly switched back to the 75D23, everything returned to normal. My advice is not to take this risk—when the size is the same, a battery with a slightly larger capacity can work, but a smaller one won’t. Before buying online, double-check the specifications, or consider compatible models like the 75B24.
