Can Maintenance-Free Batteries Have Electrolyte Added?
2 Answers
Maintenance-free batteries can have liquid added when necessary. Below is a detailed introduction to maintenance-free batteries: Advantages of maintenance-free batteries: Due to their structural advantages, maintenance-free batteries consume very little electrolyte and generally do not require refilling during their lifespan. Compared to regular batteries, maintenance-free batteries require even less attention in terms of upkeep. Maintenance-free batteries also have a low self-discharge rate, allowing them to retain charge for extended periods. Regular batteries typically need acid replenishment if stored without use for three months, whereas maintenance-free batteries can maintain charge for six months or even 1 to 2 times longer. When maintenance-free batteries require liquid replenishment: If a maintenance-free battery shows signs of water depletion, it is necessary to replenish the liquid. Otherwise, it may lead to reduced battery capacity or even cause deformation of internal structures.
I've repaired many cars and have a deep understanding of batteries. Maintenance-free batteries have a sealed structure where the electrolyte is absorbed in glass fiber separators, designed specifically to prevent users from tampering with them. Generally, you cannot add electrolyte because once the seal is broken, it can lead to internal gas leakage or acid spillage, which may corrode parts at best or cause explosion risks at worst. I've seen people stubbornly pry them open to add liquid, only to have the battery fail prematurely and even burn out the wiring, wasting hundreds on repairs. When such batteries reach the end of their lifespan, they should simply be replaced. Don't mess around with them—just choose a reliable brand like Varta and regularly check the voltage. The term 'maintenance-free' means hassle-free and convenient.