Just got this Mellif 20V battery and charger set for my power tools, and I'm pretty impressed so far!

The 4.0Ah battery packs a serious punch - it's been running my electric snow shovel like a champ through some heavy snow. The fast charger lives up to its name too, juicing up the battery in no time.

Build quality feels sturdy, and it fits perfectly in my tool's battery slot. No wobble or connection issues whatsoever.

Only downside? The charger doesn't play nice with my other DeWalt batteries like I hoped it would. Kinda frustrating when you're trying to build a universal tool ecosystem.

For the price though, getting both a solid battery AND a fast charger is still a great deal. Just don't expect full cross-compatibility with all your existing batteries.