If by "wall charger" you mean the type that comes with transmitters with the servo type connection to also charge your battery and if your battery is compatible with that voltage(most likely 4-cell) then you "could" charge the battery with it. You would need to leave it plugged in for a good while(depending on mah rating) to charge a compatible battery. You would, however, not know if the battery took a full charge. You would not have the capability to discharge the battery to see if it discharged near it rated capacity and then recharge it and see that it accepted a full charge. If you do charge it this way for this weekend, try to use a voltmeter with a load(I use a one amp load) to see if the voltage stays up during the test voltage check.