Older UPS and modern low-end UPS takes about half a day to fully charge a battery, but higher end UPS's are offering faster charge time. I took a measurement and they push as much as C/3 to C/2.5 . Which seems to be right at or sometimes exceeding the maximum charging current recommended on the battery.
How badly does this affect battery life and what's with this? Is it their plan to wreck the expensive batteries(~$100 isn't unusual even for 1000VA model) in a hope they'll make money on replacement batteries?