The bulk is part of the reason this one really delivers you a true 12000mAh. I own three battery packs, and all of them are supposedly 12000mAh. Why do I say "supposedly"? Because NEITHER of the other ones last nearly as long as this one. I have tested this on multiple charges with multiple devices. I have also done a single high-drain test with a USB powered utility light that pulls a full two amps of power.
This thing is the best by far. It's the most rugged and gives you the most true capacity. It's also the least affected by adverse weather - I've used it at drill in extreme cold (Idaho) to power lighting AND charge my smartphone at the same time. I've used this to power my bike light on bumpy roads. None of the other 12000 mAh last as long.
You get what you pay for. This is a killer deal. I don't work for new trent. I would tell you all if it sucked and I hated it because that's how I am, lol.
It's not waterproof with the rubber gasket flap open. Hahaha. It's just if your bag gets soaked or dumped in the river while this battery pack is in it, you can still wipe it off, open the port, and charge your device. The water will not damage it. But I don't recommend you try using it exposed to the rain with the ports open and plugged into a device.
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