APC Back-UPS Pro 1600 S - Uninterruptible Power Supply - Review, unboxing, testing

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My recently acquired APC/Schneider Electric Back-UPS Pro 1600 S (BR1600SI) had an issue with high-frequency noises. APC sent me a replacement which I'm unboxing and verifying, with some rather unexpected results.

0:00 Quick review of current unit, and its noise issue
1:55 APC sent a replacement, unboxing
3:12 Looking at the back sockets
4:59 Seems to be a refurbished unit
5:44 Open the cover to plug the battery (shipped unplugged)
7:25 How to execute replacement
8:04 Start replacement unit - and first unexpected result
9:09 3rd try starting replacement
12:02 Looking at the manual
12:54 Something is wrong...
15:13 idea to test old battery with new device
17:06 APC recommended to calibrate battery
25:36 Several hours charging later....
25:51 Charged over night, giving it one more try before pickup schedule
28:38 Conclusion

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• #battery