5v STM32 circuit design

I've had a circuit designed here before. I'd like to have it modified to rectify some issues. The circuit has an IC for charging, Overcharge, undercharge cutoff, balancing. The circuit or the IC seems to overheat (or get almost dangerously hot) when charging at 1amp. It is also supposed to have reverse polarity protection. This doesn't actually work, the circuit gets fried if batteries placed the wrong way. 1) there will need to be a better design for the battery circuit. I require 2 to 3 amp output. I also need at least 1 amp charging and reverse polarity protection (without that dodgy IC (tp5100)) There is supposed to be a latching circuit for turning the device on. This works for turning it on, but there wasn't any way to unlatch the power to turn it off. Or at least the person I was speaking to stopped communicating to me to explain how this worked. 2) I will need a good latching power on and off circuit. I have two buttons available. Ideally, you would long press both buttons for power on. long press one button to turn off. 3) I no longer require all the extra pins. I only require pins for two rgb led strips, not four. I need the programming pins, battery and charging port pins and the pins for the buttons. Ideally, I only want to have two battery connectors rather than four. I was told due to the amount of current, four is better. Would like to discuss this. 4) I need this as small as possible without sacrificing safety. It's better to be longer than wider. Ideally without all the extras, it should have a smaller footprint than it's current design. As for safety, I would love to hear about any design flaws you currently see that might be an issue and need to be addressed. There may be other topics I need addressed. It's been a while since I attempted this project.