True in theory BUT I bet that a Makita half hour charger gets the batteries much nearer to full capacity than a cheapo not properly regulated Argos special. (Cheap ones cannot do this as they would cook the batteries if they tried ) I asked about drills a while ago and finally plumped for a Makita 9.6 from screwfix for £76 This IS a world apart from cheap ones. No vibration when drilling tiles with an ordinary masonary bit Electric brake allows positioning of screw head easily on slotted screws Chuck is true one handed operation and grips drill bits really well I have no regrets about the extra money
HTH Phil