Why is my hydrometer telling me that my fully charged batteries are only partially charged?
I have always checked the condition of my battery by checking the specific gravity with a hydrometer. I recently purchased an Exide battery. The specific gravity of the battery stays about 1.225 whether the battery is fully charged or completely discharged. How is this possible?
TOM: It's possible with a broken hydrometer, Wade. It's time to buy a new one.
RAY: I'm sure you can find some mechanic who's dying to sell you his, since 99.9% of all batteries sold these days are maintenance-free and never need to be (and in most cases CAN'T be) checked.