The name Leagoo might not ring a bell yet, but the Chinese smartphone manufacturer has been eyeing the Singapore market for a while now.

It launched the Elite 2 and Elite 3 mid-range smartphones here in May last year, and its phones have been sold at electronics shows as well as at more than 100 shops around the island.

The latest Leagoo product to hit Singapore shores is the mid-range Shark 1, a 6-inch phablet with a whopping 6,300mAh battery.

To put this in perspective, most phones have a battery capacity of between 2,000 and 3,000mAh. The Apple iPhone 6s Plus has a 2,750mAh juice pack, while the Samsung Galaxy S7 edge clocks in at 3,600mAh.

When I used the phone, it lasted over two days on a single charge, and I am a reasonably active user. Leagoo claims that it has over 770 hours of standby time, or 25 hours of online video streaming.

However, this incredible battery life does mean that the 240g phone is a lot heavier than most other phones with a similar screen size.

The iPhone 6s Plus and the Galaxy S7 edge are both 0.5 inch smaller, with 5.5-inch screens.

Yet, they weigh 40g and 83g less respectively. Despite the hefty weight, though, Leagoo has managed to keep the phone surprisingly sleek. It has very thin side bezels, and the polycarbonate shell of the phone is fuss-free.

On the back of the phone is a 13-megapixel camera, a fingerprint sensor and a speaker grille, while on the right is a volume rocker and power button.

The Shark 1 ships with Leagoo OS 1.1, which is based on the last-generation Android 5.1. It has a default black-and-gold theme which I find a little garish, but it also has a few nice inbuilt features, like a smart remote control and a tray icon that opens and closes notifications.

It runs on a MediaTek MT6753 chip, which is also found in the HTC Desire 628 and the LG X Cam. It is a mid-range processor, and there are noticeable stutters sometimes when the phone is doing tasks such as opening the notification drawer.

The phone's cameras are not very impressive. The rear camera takes several seconds to focus, even in well-lit areas, and the front one produces pictures so grainy that they look like they have been filtered.

While I think that the battery life of the phone is definitely a huge plus, this is mitigated by mediocre performance in many other areas.

Instead of a primary phone, the Shark 1 would probably function better as a secondary phone, perhaps for travel or as a company phone, as it does not need to be charged up as often as a regular one.

•Verdict: Amazing battery life, but mediocre performance otherwise.