Cheaply Rebuilding My APC UPS Battery Pack, Runtime Calibration, RBC7 Smart-UPS 1500, Pro-Elec Cells

In this video I switch out and re-rebuild the battery pack in one of my APC Smart UPS 1500 battery backup units. This is a unit I have featured on the channel previously which runs my main gaming / workstation PC setup. I had already rebuilt the original APC RBC7 battery pack some years ago (back in 2015) with Yuasa NP18-12B (12V 17.2Ah) cells last time.
However this time I'm doing it 'on the cheap' and opted to try out a cheaper brand 'PRO-ELEC' which is made by CPC Farnell. The cells I use this time are model PEL01438 rated at 12V 18Ah, so theoretically a slightly higher capacity too.
The Yuasa cells / batteries have always been my favourite preferred brand to use as I've never really had any major acid leaks or bad cell bulges occur with them and they seem to have a long lifetime before failure. However due to recent stock/supply issues (at least here in the UK back at the time of filming) and some considerable pricing increases I decided to look elsewhere this time and give something else a try.
At the time of filming the best price I could find for 2x Yuasa NP18-12B including delivery was £114.
The 2x Pro-Elec PEL01438 I am trying cost only £74 including delivery.
That's a massive price difference of £40! - Enough to purchase another battery and still have change left over.
However even the more expensive option of using the Yuasa cells is still considerably cheaper than purchasing a pre-made compatible RBC7 battery pack and they are really easy to disassemble and rebuild.
I also run through my standalone 'software-free' method of runtime re-calibration using a simple fixed load (halogen floodlight) and charging / draining / fully recharging the UPS battery so it re-learns the correct runtime and doesn't trigger false low battery alarms prematurely.
This is needed as when you replace the cells in these APC battery backup units you must also re-calibrate them with an appropriate load attached to ensure that the low battery alarm only goes off when it actually should. If you don't re-calibrate the unit then you will find the alarm keeps beeping constantly even when the batteries aren't actually running low as I've demonstrated in past videos.
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Recorded in 4K Ultra-HD using an iPhone 6S.
TIMESTAMPS:
00:00 - Intro
00:05 - Dead Battery Demo & General Explanation - Cheaper Batteries
02:02 - Stripping the UPS down & removing old batteries
04:11 - Taking apart the old battery pack
06:00 - Building the new battery pack - wiring and fuse
08:56 - Strapping the new batteries together securely with tape
12:22 - Installing the newly build battery pack back into the UPS unit
14:05 - Simple calibration procedure setup and explanation
17:57 - UPS battery dies - Recharging to complete calibration

[@CapitalCurrency]

I have one of these I got from a place I use to work at. They wanted to toss it in the trash so I took it. What exactly does it do? Does it just keep your computer on for 20 minutes if the power goes out?

[@ZunairParviez]

It is pretty usefull if your area has power shut problems this UPS will keep your load working even if there is no power coming from the grid. In my country we have this problem where power outage is a common problem so i installed it with bigger batteries like 120AH 24V after doing some modifications to the UPS. Now i have 24x7 AC power which is good !