I need a 5V charge controller to be used with solar panel. All the Lipo type charge controller I found... comes with 4 connectors (current in and battery. but it missing connectors for the load.) What I need is something like this one (it has 6 connectors) but lower voltage and power... hopefully smaller in size. Anybody can point me to a circuit diagram to make one of this controller in lower voltage? or a commercial product in smaller size and in the similar price range. Here is what I need, Input: 0 to 8V Input current: 0 to 2A Output: 5v Output current: 500mA Battery: 3.7v Li-Ion ( I can make it 7.4v adding 2 battery, if that simplify the circuit a lot for not having step up circuitry) output should be consistent as much as possible. and automatically/continuously charge the battery whenever higher input current is available. Thanks!