The Samsung Galaxy S7, along with its variants including the Galaxy S7 Edge, are expected to be unveiled in the coming weeks at Barcelona's Mobile World Congress 2016.

According to new leaked documents, the latest Android M flagship from Samsung could pack a huge battery, along with the return of the waterproof design lacking from 2015's Galaxy S models. Here are the details.

The latest rumor to come out of the Samsung Galaxy S7 hype machine comes from TechnoBuffalo, which purportedly spotted a waterproof rating for the Samsung Galaxy S7 and Samsung Galaxy S7 Edge in a shipment/import document leaked online.

Both models were marked as featuring "waterproof" components, such as the SIM tray and microphone. The tech blog remained cautious, adding that there was no specific mention of an IP67 rating, last featured by the company in the Samsung Galaxy S5. The mention in the shipping documents could simply imply a splash-proof rating. In particular, the Galaxy S7 Edge only listed a single component that was water resistant.

And that's if the documents turn out to be authentic. So, while the listing does seem to imply splash resistance at the very least, take this with a healthy grain of salt.

The other major component that's been leaked in documents online comes from the FCC itself, via 9to5Google. According to FCC filings, which contained a "battery info" screenshot marked with a legitimate FCC ID, the Samsung Galaxy S7 Edge will have a 3,600mAh battery. This means a bump in battery capacity from the Samsung Galaxy S6 of 1,000mAh, if the document is truly genuine and accurate.

This would mean that the Galaxy S7 Edge would pack one of the highest capacity batteries available on the market today, surpassing the Nexus 6P's already enormous 3450mAh juice pack. Meanwhile, the non-edge variant of the Samsung Galaxy S7 still seems to be getting a 2,700mAh battery, according to previously leaked documents.

Could Samsung be planning entirely different batteries for the two major variants of its flagship smartphone? Last year's Galaxy S6 Edge had a larger battery compared to the plain flagship, but the difference was only by 50mAh. Or could one of those rumor reports be wrong?

We'll have to wait until Samsung unveils the Galaxy S7 and Galaxy S7 Edge in Barcelona at the Mobile World Congress 2016 in a few weeks to know for sure, but a bigger battery is certainly a possibility.