I'm putting together a wireless power transfer based battery charger to charge an 11.4 V, 3830 mAh battery from the output of a 15 V voltage regulator I made.
Due to a limited understanding of battery charging circuits, I'm not sure if the output of my simulation indicates that the circuit is functioning as intended to charge the battery. The voltage is very messy looking but the steady-state current looks close to where I think it should be in order to charge up the battery in 45 minutes to an hour.
Note that the simulation shows voltage and current from the 0.1 Ohm load I placed where the battery will be hooked up.
Here is the waveform. The voltage is all over the place but the average current is around 1.3 Amps. GREEN is current at the load, BLUE is voltage across the load.
Should the messy voltage signal across the load be a concern if the steady state current is reasonably precise to the desired value? I placed a 0.1 Ohm resistor based on Battery University's suggestion of typical charging battery internal resistance.