Motorbike batteries only need to be fully charged and they run out of charge after only a few uses; or a fully charged battery runs out of charge after a few days, because the battery’s pole plates are severely sulphated.
When a battery’s poles are severely sulphated, a layer of coarse white lead sulphate crystals form on the poles, reducing the amount of active battery material involved in the chemical change. This layer of crystals prevents the penetration of the electrolyte and reduces the capacity of the battery, making the battery quickly fully charged but with very little capacity, so it will soon run out of power when used. The main reason for sulphation of the battery is that the battery has been undercharged for a long time, or has been in a semi-discharged state for a long time.
If you find that the battery pole plate is seriously sulphated, you can first discharge the battery, pour out the electrolyte, then inject the electrolyte with a density of about 1.15, charge the battery with one fifteenth of the current until bubbles appear in the electrolyte, then reduce the charging current, when the bubbles in the electrolyte rise sharply, pour out all the electrolyte in the battery, then add the electrolyte with a density of 1.27-1.29 electrolyte to charge the battery. When the bubbles in the electrolyte rise sharply, pour out all the electrolyte from the battery, add an electrolyte with a density of 1.27-1.29, charge the battery with a small current, fill it up and finish it, then charge it again when finished.
Severe sulphide can be added to distilled water and charged in the same way, so that the lead sulphide dissolves in the distilled water under the action of electric field, line into an electrolyte with a very thin density, wait to be filled with a large number of bubbles, then discharge, finish and charge again, repeatedly. At this time, check the change of electrolyte density in the battery, if the electrolyte scale is no longer high, the battery capacity also rises to eighty-five percent If the electrolyte scale is no longer high, the battery capacity rises to eighty-five percent, pour out the solution in the battery and inject new electrolyte into the battery.