How to open and repair Duracell 600 Watt PowerPackPro

I’ve purchased recently (aprox 45 days ago) a Duracell 600 Watt PowerPack Pro starter battery. It has good reviews on Amazon, but most of those reviews are for an older model (Duracell 600 Watt PowerPack battery). I purchased this battery because it has a 600W inverter and therefore you can use it as a AC…