When got my battery for my bike it was dry and I had to add the acid. I measured the voltage after I added the acid and it was already at ~12.1v. I didn't even have to charge it... Just hooked it up to my bike and it's been working perfectly ever since. Starts up every morning, even when it's really cold and the bike doesn't want to fire (it'll spin ~800rpm). I haven't had a single worry about having a dead battery.
I have to disagree with this posting.
Yes, the battery activates with the addition of electrolye, and the voltage appears normal, possibly even high. A battery at 12.1 volts is most certainly NOT fully charged. However, the voltage is only part of the story. You could get this voltage even if you insulated 80% of the plate material in each cell. The peak capacity of the battery, or the ability to provide rated power is acheived only after the full saturation initial charge. What this initial charge is supposed to accomplish is full involment and saturation of all the electrolye and the porous plate materials, voiding any air pockets, and eliminating oxidation of the plate material during storage. This cannot be acheived without charge currents, and high charge currents can damage and overheat the battery before full saturation occurs. Ideally, you want to slowly sneak up to the full 14.5v battery voltage charge peak with diminishing charge currents as you approach this level. This should be accomplished with equipment normally found at the point of sale. Or, the seller should ensure that the buyer has capable equipment to provide this function at time of installation. Batteries that have not had the proper initial peak charge will have a shorter usefull life than ones that have, though there are cerainly other storage and maintenance issues that can also curtail battery life.
Batteries not properly charged initially may not ever reach their peak storage rating. Your bike may appear to operate fine with a battery operating at 80 or 90 percent of its capacity. The capacity is NOT measured solely with a voltmeter, but also the current and time span of the drain. This is not normally done with lead acid batteries, unless a problem is suspected, because each discharge/charge cycle shortens the useful life of the battery.
The following characteristics will tell you if a battery has been properly charged:
1. The specific gravity of the acid is over 1.275 (conventional type batteries only).
2. Maximum voltage output across battery terminals can be maintained at constant level for two hours.
3. Open circuit voltage is stablilized @12.7v or higher
Cheers,