HighestCharge

Battery* Rover::HighestCharge() {
    Battery* b;
    int highCharge = 0;
    for(int i; i < batteries.size(); i++) {
        if(batteries[i]->getCharge() > highCharge) {
            b = batteries[i];
            highCharge = batteries[i]->getCharge();
        }
    }

    return b;
}