Current Drain in Perspective

[Ducati750cc]

Originally Posted by MarkS

Can you drill a small hole in the filling cap, use a syringe to top up the water, tape over the hole afterwards ?

Not a good idea especially with many modern batteries, six holes, ensuring that whatever you seal them with will retain the design integrity of the caps which will be to prevent electrolyte spillage and reduce the venting of Hydrogen, for the safety of the consumer and anyone handling them, tape won't hack it !


Have a read at this, it's a bit of info on how many modern batteries have features to reduce water and Hydrogen losses and how it is achieved:






In an open, flooded battery, any gas which is generated can escape to the atmosphere, causing both safety and maintenance problems. A sealed lead acid (SLA), valve-regulated lead acid (VRLA) or recombining lead acid battery prevent the loss of water from the electrolyte by preventing or minimizing the escape of hydrogen gas from the battery. In a sealed lead acid (SLA) battery, the hydrogen does not escape into the atmosphere but rather moves or migrates to the other electrode where it recombines (possibly assisted by a catalytic conversion process) to form water. Rather than being completely sealed, these batteries include a pressure vent to prevent the build-up of excess pressure in the battery. Sealed batteries require stringent charging controls to prevent the build-up of hydrogen faster than it can recombine, but they require less maintenance than open batteries.
Valve regulated lead acid (VRLA) batteries are similar in concept to sealed lead acid (SLA) batteries except that the valves are expected to release some hydrogen near full charge. SLA or VRLA batteries typically have additional design features such as the use of gelled electrolytes and the use of lead calcium plates to keep the evolution of hydrogen gas to a minimum.

[MarkS]

Q1: If 30mA over 24 hours = 30kJ, how come 75mA = 100kJ, not 75kJ.
Q2: What's an 'og' ? A metric erg ???

I wonder if I've scored an Own Goal