Air compressor & lead battery

A special connecting hose tool is prepared for combining two compressors, an one touch connector with two way dividing construction tool and 1m hose with attachments on both side are construction.

The reason why I had been planning this is the two small compressors equipped in the corner of garage pit, the tank capacity would be doubled if the tanks were connected by some air way?

The larger the tank capacity becomes the more stable the air tool performances would be improved if my planning would come true? And the electric wiring are connected for both of them, the recovery time would be saved?

Though the parts obtained yesterday were relatively expensive, the stress and frustration I have been experienced when high power air tools were used would be eliminated thoroughly?

The time is come to give additional lead battery charging on XH200 OPEL B-Vectra, some dark current may exist or the lack of charging capability on Bocsh alternator 120A?
I don't know why the phenomena lack of charging supply occurrs in spite of relatively big volume charging capability with 120A?

Once B-Vectra's car battery was re-burdened in BC7 SUBARU Legacy LSi US model, that had been deserted because of the reason, lack of storage volume(capacity) and lower electrolyte specific gravity.

Over 2 years have passed since that battery converting experiment, even now the ruined battery is in healthy condition also regaining the electrolyte specific gravity.
This experiment proved that the battery can survive if the treatment after the critical stage was adequately performed the ruined car battery often awakes again and continues it's life much more period of time.

The word mentioned here "adequately" means the procedure for de-sulfation on the surface of the terminal were performed in the correct manners.