For WATT it's worth... Had a yuasa tech tell me they prep their competitors batteries like this:
BS stands for 'battery acid supplied' and when you add the acid, you wait over an hour to let the liquid soak into the plates.
If it said 12n12a, or 12n14a, it means it's 12v and 14 amp hours related.
The charger has a rating and it may say 1.5a rated. To figure out what charger you need, move the decimal point over to the right, meaning, a 12a rated battery needs no less than 1.2a rated charger. A 14a battery would need at least a 1.4a rated charger. You drop the charge if you used a 1.2a rated charger on a 1.4a rated battery.
The hour has lapsed, the fully charged battery has been charged for its initial 14 hours [literally] @ 1.4a hours.
A 12a battery would be charged for literally 12 hours at its decimal amp rating.
Using a set of jumper cables, I ran the battery down using a high beam bulb and a taillight bulb's stop filament(s). This drew the charge down faster to 1 or 2 volts and then charged the battery back up to 14 hours worth. This was done 3 times as per tech's walk thru. The final 3rd charge was then installed into service.
Bought a leftover bike (2 years older from date purchased) and called the manufacturer to ask if a dry battery has a shelf life? He said it should work and we segway'd to the prepping of a battery. This battery lasted 6 years and sold the bike with the same original battery. Every time I buy a BS style battery, this is my pre-service prepping of said battery style. Took the 2013 battery out of my totaled bike and put it in the current bike. What year is it today? It's still in service as of this date.
Signed,
NOLTT (no one listens to turtle)