They may suck, but not one has blown up and are the only battery manufactured for vapers. They even sample test them by drilling a hole in them making sure they don't go nuclear on you.
I know vapers don't want safer batteries. They want high performers that can explode without warning which the manufacture warns do not use in e-cigarettes. I know it is sad and more legs and faces are going to continue to be shown in the news and the masses are going to blame it all on the e-cigarette. Then the government is going to step in and outlaw them claiming they are unsafe.
Actually accidents or misuse, however you like to call it, has become less prevalent. Now this may be due to more knowledge, safer mods, and/or safer batteries. I personally think it has to do more with mods providing what people want/need and helps push people away from mechs.
Nothing wrong with mechs but with many not understanding how to use or ignoring, then false labeling of batteries and/or fakes, it created a large problem. I love my mechs by the way and we may see a resurgence of problems with the cheap single battery sqounk trend.
In the end though, no battery is made for vapers and if you look, the companies that say they do are located in China. Now that doesn't mean they are a bad company but they are a company that cannot be sued. There is no legal recourse for a consumer if they have a problem with a device or are injured by it.
I don't fully believe Aspire makes their own batteries, they are subcontracting to a factory and supposedly overseeing production and quality control. That still doesn't mean they are actually making them. A good example would be Hohm Tech, they rent floor space inside a factory but do not own it.
I'm not going to say if they are good or bad batteries, just like not all re-wraps are bad but I know not all are good. The big problem is a re-wrapper may not be using the same battery all the time, they use what they can get but don't change the pre-printed labeling. Efest at one time was buying from multiple companies and relabeling all the models the same, not good.
Vapers (one's with sense) want safer gear but most importantly we want honest companies. We are tired of the false advertising. If companies would run more transparently about what a product is and can honestly do we'd all be better off. That's why we see a big difference in the power ratings of mods made in countries where they can be sued, like the US and companies operating out of places where they are safe like China.
In the end it all comes down to one thing....legality. Proper battery companies will not say they make a safe vape battery or even an end user battery. They would be open to too many lawsuits as well as more regulation, which costs money. These batteries were designed for electronics, to be bought by manufacturers and sealed inside of devices.
If a company states they are making their own batteries, then look to see if a new factory has opened. Check the name of the factory against other products and manufacturers. If you do, you'll soon see that there are very limited places that are making batteries. It is a costly, dirty, dangerous and expensive business. Not just anyone can just start making batteries, aside from the knowledge side, the components are highly regulated in large quantities, even in China.