Not sure about the "bump charge" but i have seen positive outcome by allowing my device to turn its sell off when the battery is to low. When its off, plug it in and wait for it to fully charge. Then while the phone is still plugged in power it on. Let is sit for another 20 minutes or so charging then you can take it off the charger and use it. This has worked well for me and other people when trying to calibrate a battery.