Can You Charge A Battery With A Lower Voltage Charger. Do not forget to open the electrolyte inlets of the battery during this process as charging creates gasses and emission which must leave the battery. Using this setup batteries can be charged and recharged.

When charging you can leave your battery connected if youre using a trickle charger designed to retain your battery at a specific amount of charge for lengthy periods. Lets say it for one last time absolutely you can do that. A lead-acid charger that can be set to charge no higher than 146v can be used for regular charging and then MUST be disconnected after the battery.
As laptop charger voltage is about 19 Volt create a series connection of the 12-volt bulb charger and the battery to maintain the voltage level.
Trickle chargers keep automotive batteries from running out of charge. In this case you can charge the battery CA CACA up to 100 percent. Anything below that wont be sufficient to reach the pressure to pump anything into the battery. You might see the battery charge but the laptop is not powering on or it may run on power but the battery wont charge.

