There are large numbers of sealed lead-acid UPS batteries made in China. Cost has been driven down to about half of what they used to cost.
Back 20 years ago in order to keep cost down I used to buy used batteries that had been rolled out of medical equipment after two years use. Once made in China batteries came onto the market at the same price as those used batteries I stopped buying the used batteries.
Back 20 years ago in order to keep cost down I used to buy used batteries that had been rolled out of medical equipment after two years use. Once made in China batteries came onto the market at the same price as those used batteries I stopped buying the used batteries.