When operating in battery only mode, high system peak power can cause the VSYS to drop below the minimum system voltage due to impedance of battery pack, charging sense resistor and BATFET. Device incorporates VAP mode to help supplement the system during high peak power events by releasing energy previously stored in the input capacitor. While the system is operating with normal power loads, the charger can be configured to store energy in the input capacitors by charging them up to a programamble voltage level. During these high system power spikes, the energy stored in the input capacitors will supplement the system, to prevent the system voltage from dropping below the minimum system voltage. The VAP mode can help achieve much better Turbo performance for Intel CPU under battery only condition. Please contact factory for more detail information about VAP mode.