SUPER UPS Battery Hack- Mikes Inventions

The SUPER UPS Battery Hack,. Have you ever wanted your electronics to run longer on battery power? I have. So now they do. I swapped the tiny SLA batteries in my APC battery backup for two deep cycle batteries to get ludicrous run time. This procedure would work with CyberPower brand just as well as the APC that I have. The key is to match the input voltage to whatever your UPS is using now, which is most likely 24v. I’ve never seen anything other than that. You’ll need 24 volts worth of batteries, a UPS, some wire, terminals, a fuse and holder. Check it out!


  1. 5150markass on April 13, 2021 at 11:59 pm

    Hello. I have the same apc as you and when I doubled the size of my battery amp hours, my apc will still shut off with the same amount if time used as before my upgrade. How did you trick your apc to stay on longer than it was programed to be on from the factory with a specific amount of load? Very frustrated because I didn’t get any benefits of doubling my batterys

  2. Dora Izchi on April 14, 2021 at 12:02 am

    So I’d love your thought on this:
    I m in an RV. I rented a hotel room to charge up all of my devices & brought my APC in because it was on a shelf for 4 months. I plugged-in everything in fell asleep& woke up to a call I was late checking out! My alarm never going off becuz the hotel had an electrical problem that night and nobody in the back had electric. When I checked out they had 2 electricians vans there. My regular battery pack for my phones and tablet was at 11% So the electric charged from their one outlet for that long. When I checked all of my devices as I packed up, the APC light "Building Wiring Fault" was on. The next chance I had to plug in my APC the siren went off. Now I’ve plugged-in it in for 28hrs and the siren is STILL GOING OFF. Could something at that hotel have ? ruined my battery for the APC? Or the APC itself? or in your opinion is this just a strange coincidence? Or what do you think?

  3. Kalyan Bonam on April 14, 2021 at 12:04 am

    Can i use it for my gaming pc ?

  4. Daimon Wilcox on April 14, 2021 at 12:05 am

    If you use the apc cable and reset the battery it will learn the new battery

  5. #16 Racing on April 14, 2021 at 12:06 am

    Do not use wet cell batteries (car batteries), they are designed for cranking amps and not capacity. Running them down destroys them. Also when recharging they vent hydrogen gas so keeping the batteries enclosed like you have is just asking for trouble. Use AGM batteries FFS

  6. Bio Hacker on April 14, 2021 at 12:06 am

    To complicated for the average guy, I just need a backup to plug my tv an router for 2 hours any help please?

  7. Vipin Akbar on April 14, 2021 at 12:06 am

    Thanks for the video, I liked your idea and now plan to execute on my BR1000G. Its internal battery are dead. Will the current from APC be sufficient for charging high capacity batteries? Any limitations to consider while choosing the battery size?

  8. pipo declown on April 14, 2021 at 12:09 am

    Hmm…..I think the minute counter is adjusted to the original battery and won’t notice that there is a larger battery then before. I have a car battery on my backup APC 700ES but it gives me only about 13 minutes before it’s shuts down my PC. It just don’t know about the bigger battery.

  9. Remmik on April 14, 2021 at 12:09 am

    If you are going to do this please install a full time vent system to the exterior. Maybe even move the batteries to a vented box outside and run your wires in. Gases from an unsealed lead acid battery are explosive, especially when overcharging. Like you stated, the UPS has no idea what type/size of batteries you connected. “So far, so good” are famous last words.

  10. Sky_Lord on April 14, 2021 at 12:09 am

    Hello. Very good video. I have been thinking to do the same for my ups long time ago. The issue here is; 1) When the ups will be in battery mode, its inverter will starts to overheat. How much depends on the load that will be at the output. 2) If it works for a long time, or many hours then the mosfets is most likely to break down. The manufacturer has calculated a specific time based on the output load and the autonomy of the battery. If you go through this then it is most likely to burn the ups as well. In my opinion, if someone makes such a modification like this, to increase the amperage of the battery by almost twice and not more. For example, if it is 9Ah to go to 18, etc. This will make the inverter less likely to burn out.Again a very nice project, greetings from beautiful Greece!

  11. BRUHItsABunny on April 14, 2021 at 12:09 am

    I see some comments that on this video that sparked some further questions, if anyone could help out that would be great

    1. I saw a comment saying that the lower amperage charging system inside the UPS would end up slowly reducing the batteries’ lifespan. Now, I don’t think that is the case since it would basically be trickle charging and I don’t know of any case where trickle charging is capable of doing such harm

    I suppose unless the charging never stops, like when the batteries are fully charged but the UPS keeps charging.

    How do I know if my UPS automatically stops charging the batteries? The stock/regular batteries I think it always does but since it can’t estimate the approximate runtime on different batteries how do i know for sure the UPS knows they are fully charged?

    2. Are there any precautions regarding hydrogen gass that I have to keep in mind?

    3. I saw someone saying that it would be wiser to do this on a smart UPS rather than a regular one. Is that true, and if so why? Would it really be such a big difference?

    I’ve slowly been working on some plans of doing this at home, i suspect this year will be the year i push through with my plans though

    nice video btw

  12. Chuck Brown on April 14, 2021 at 12:09 am

    How long it last when it fully charge and on pure battery mode no grid charging batteries ? Have you tried deep cycle batteries they hold the charge longer ?

  13. 2009mechanic on April 14, 2021 at 12:12 am

    I’d be more interested in running a forced air gas furnace for a couple days to keep the house warm during a power bkackout.
    Would there be any output capacity differences between the wet cell batteries vs. the SLA battery types??

  14. Rahul Hingonekar on April 14, 2021 at 12:12 am

    Good hack but make sure it’s not become a ticking bomb, btw I have a BR1500G-IN and it’s internal battery just dead today after 3 years and I am thinking to do some hack as you did but really scared 😃😃

  15. svtcontour on April 14, 2021 at 12:12 am

    Dont these deep cycle batteries off gas hydrogen?

  16. Yony Fernandez on April 14, 2021 at 12:15 am

    imagine doing this, but having the UPC unplugged, and charging via solar, rather than plugged in. This would be a good way to just go green but using the UPC as an inverter

  17. Joel R G Gizmo on April 14, 2021 at 12:15 am

    I currently have two of these they were both gifts.
    One of them works the other one has dead batteries I think this experiment will be perfect for the second one as well as maybe upgrade in the first one.
    The model that I am running.
    The first APC unit I would like to use specifically just for my star link Internet dish. It runs 100 W.
    If I do this modification and change the batteries. What would the approximate runtime be I’m not holding you to anything just approximately .
    That would only most likely just be the star link and the two network switches.

    Every Mac every TV in the house has its own separate battery back up because we lose power as all the time.
    PlayStation and Xbox one both have their own separate back up as well.
    Takes 20 minutes almost for the DVR to come back.
    Sometimes we only lose power for 10 minutes now we have to wait forever for it to come back on right in the middle of a football game.

  18. Dark Meta on April 14, 2021 at 12:15 am

    You should collect old used "dead" gel batteries, (people literally throw ups’s away by the thousands.. get like a hundred of them lol. and get a reconditioner, which u can create a massive power bank from for free (pretty much free anyways)
    but that would be amazing. maybe a nice mppt controller and jack in all your off grid sources input to there making a centralized mass power storage system that would last months if needed xD

    if u do solar: btw 24V with mppt is legendary! never use 12V w solar lmao.. only noobs and charlatans do that 😂

  19. John on April 14, 2021 at 12:16 am

    not all UPSs will work, some have a hard set run time limit before they will shut down regardless of how big your battery capacity is. (over heating protection as they don’t have adequate cooling for heatsinks)
    out of interes what brand and model is your UPS unit?

    have a bank under my house consisting of 8 batteries, shoudl give a good run time 😉

    oh, also, deep cycle are a must standard car batteries are not designed to be drained and not be damaged.

  20. kuruki zen on April 14, 2021 at 12:18 am

    can you make a list and keen details of what materials did you use..(cause im not a techy person)
    i want to build this to backup my PC. ^_^ thanks!

  21. Sabre Sound : Sabre Sharp Sounds on April 14, 2021 at 12:20 am

    The man needs to manufacture a boat load of these things and sell them on Amazon for the average non DIY guy PLEASE DO THAT🙏🏻🙏🏻🙏🏻

  22. wlcsp on April 14, 2021 at 12:22 am

    So the basic idea is putting an additional battery in parallel to the original (UPS), right ?

  23. Siddharth on April 14, 2021 at 12:22 am

    Do you want to know how I am bringing old batteries to life again let me know if you are interested to know.i saved 100’$ of doller per year just because of this hack

  24. Dark Meta on April 14, 2021 at 12:23 am

    i forgot what you did, but for anyone interested or if you don’t already know- marine deep cycles operate slightly differently than normal 12V lead acids or gels. should be 13.4V When fully charged if not damaged inside too much. or maybe 13.2/13.3 is perfect health usually. Having a health tester is a godsend. really let’s you know what’s going on under the hood so to speak.

    But hope your setup is working ok! It must have some intelligent charging going on. So that’s good. Any old ups would not be recommended for just any marine battery. Although they may work, they might be damaged or unreliable or just not perform as well as they could. Just saying from experience lol. plus always make sure it’s a True deep cycle. They are between a starting and deep cycle, lots of people don’t realize but some aren’t fully deep cycle. Great video boss xD

  25. Respect & Peace on April 14, 2021 at 12:23 am

    hi Mike, thanks for sharing. Q: where to you put the 10amp inline fuse?

  26. Björn Initial Production on April 14, 2021 at 12:23 am

    Hey i found this in the used market. APC Smart-UPS SC 1000VA and thinking of adding 2 of these (also used market but new i box) Fiamm 10-års blybatteri (lead-acid) 12FGL42
    EAN 5710927030145 12v 42Ah total cost 200 usd this would in theory if your hack works for this setup be stronger then anything new i can buy. Would the combination work. it has 4 x 6v batteries in series by default as far as i can tell.

  27. Jeremy Poulin on April 14, 2021 at 12:25 am

    Be careful of using flooded lead acid batteries due to off gassing.

  28. KM 0 on April 14, 2021 at 12:26 am

    I did the same thing a while back. This set up works but one thing has to be considered, UPS’ are not design to work for extended periods of time. They have very small heatsinks on the Mosfet/transistors and most don’t even include a fan to keep them cool so they end up getting damaged by overheating. Of course to help on this issue you can add your own fan.

  29. ze da Cruja on April 14, 2021 at 12:26 am

    Nice work ,I have a very small MANHATTAN Battery backup do you thing your ideia will work with this one.its only a 5amp

  30. George Done on April 14, 2021 at 12:28 am

    There is no concern regarding the recharge circuitry ? If the batteries get deep discharged during a prolonged power outage when the power comes back the recharging circuit could be overwhelmed by the amount of current required by such large batteries and enter protection or worse.

  31. Mikes Inventions on April 14, 2021 at 12:31 am

    Still going strong after 7 months. The UPS charging circuit brought the batteries all the way up after several days, and since the batteries are so large, it’s as if the batteries are on a trickle charger, like they would be anyway. The minute counter on the display is still meaningless, because the UPS has no idea how big the batteries are, but it is somewhat useful for judging relative charge. The minutes just tick down at a much slower pace. I haven’t needed to use them for more than about an hour or so since I installed them, and the internal charger on the UPS worked just fine. Now I plan to use my large auto charger if I run them down a lot so as not to strain the UPS charger circuit. So far so good… Stay tuned.

  32. Senjoro Nie on April 14, 2021 at 12:31 am

    The big problem I’ve run into is voltage drop along the feeder lines from the battery to the UPS DC input, and also within the internal wiring supplying the inverter. I’m running an APC Smart-UPS 750 and under high load (250+ watts) the DC voltage across the inverter input (on the board itself) can be as much as 0.6V less than that measured at the battery terminals. It causes the UPS to think the battery is about to die even though it’s not even close. I replaced the external feeders with 10awg and this reduced the voltage drop to about 0.3V, and my next step is to replace the internal wiring with 10awg as well as eliminate as many of the spade connectors as possible as they are all sources of higher resistance and therefore voltage drop.

     I’d expect the 16awg extension cord you’re using to suffer quite a lot of voltage drop; what, if any, issues have you had with that in your case?

    edit: Be advised, when you calculate the number of amps using I = P / V , the number you get is the *average current* drawn, averaged over time. In reality, the current drawn from the battery is not a constant current, it is a pulsating current consisting of periods of current draw, and periods where little current is drawn. Thus, I = P / V tells you 25A, the average current over time is 25A, but because the current is pulsating, the pulses will actually be well in excess of 25A, and as a result, voltage drop will be higher than you would expect if you simply used V = I / R without further consideration.

    To illustrate, consider a constant 2A through a resistance of 1 ohm. By P = I^2 * R, the power dissipation is 4 watts. Now consider a pulsating current with periods of 4A (on) and 0A (off) at a 50% duty cycle. The current averaged over time is 2A. By P = I^2 * R we see that power dissipation is 16 watts while the power is on. At a 50% duty cycle, power dissipation is 8 watts, twice as much as a constant current of 2A, even though the average current over time is still 2A. Your UPS draws a current that pulsates in time with the switching transistors, it does *not* draw a steady, constant current and this definitely does impact performance (voltage drop and power loss as heat higher than expected, battery life shorter than expected).

    Finally, as to heat issues, I run my APC Smart-UPS 750 on the 7.5AH internal battery paralleled with a pair of marine batteries (in series) of 115AH. Properly managed (turn off unnecessary lights, etc.) the unit will run for 18 to 24 hours. The transformer does get warm (temperature exceeds 80°C) without additional cooling. I put a 3-inch computer fan onto one of the case vents and as far as I can tell, even at high load the transformer temperature (external, measured on the iron core) never exceeds 40°C, generally doesn’t exceed 30°C. That is quite acceptable and in my opinion active air cooling is highly effective at removing waste heat and keeping temperatures in check.

    Ideally, to minimize these issues, all of the wiring in the low voltage circuit should be replaced with 10 awg, and all blade/spade quick connects or other plugs should be removed and/or replaced with soldered connections, including soldering directly to the transformer’s connection tabs. On my UPS the low voltage circuit contains exactly nine (9) connection points, each of which is a point of higher resistance and therefore voltage loss. Eliminating just two of these and replacing just the external feeders with 10 awg cut voltage drop by half and resulted in longer runtime and lower waste heat load. I will be replacing the rest of the wiring with 10awg this weekend. Easy to do and no reason not to.

  33. nitrous dude on April 14, 2021 at 12:32 am

    two questions: the first is about running your electronics off a modified sine Wave inverter and second, have you increased the cooling or current carrying capacity ie swap out the MOSFETs etc? These units have a pretty short duty cycle unless the board can be populated with transistors to add capacity. many of these units all have the same circuit boards, just increased capacity with changes to the output stage.

  34. Willie Colón on April 14, 2021 at 12:34 am

    Mike, What about overheating I need to rub amini computer and a satellite receiver. Probably 8 hours at a time.

  35. Danny Sells on April 14, 2021 at 12:36 am

    I had the very same Idea but also maybe pre charge the battery with solar panels first

  36. Tim M on April 14, 2021 at 12:37 am

    This is a really dumb idea. The UPS is not rated to handle the DC fault current. DC Fault=welded contact=extreme over heating=fire=lose of house. Insurance claim will be denied due to a non listed UL device causing the fire. All of this inside a wooden enclosure. Not sure what your background is, but it’s not electrical engineering. PS, also wait for the lawsuits to hit you.

  37. Delmar Schmidt on April 14, 2021 at 12:38 am

    You really need to test the runtime as you will make a revolting discovery. The UPS ignores actual battery voltage and instead calculates the AC load based on the standard battery capacity.
    It will shutdown at the same time regardless of my many batteries you connect.

    I contacted APC to see if there is a method to change the default battery capacity. Found nothing in the PowerChute software, and running a self-test has no affect.
    Only fix is to swap with a XL version factory designed for external batteries.

  38. Edward small on April 14, 2021 at 12:39 am

    How is the fuse incorporated

  39. Packrat’s What If. on April 14, 2021 at 12:40 am

    Yup, go good project to work on. But if possible, try to find an inverter that runs off of 48 volts as they run more efficiently and this is one I would like to use to run my gas furnace on. My problem is trying to find true deep cycle batteries that I dont have to take out a mortgage on.

  40. Joel Walgenbach on April 14, 2021 at 12:41 am

    Do you worry about hydrogen gas generation as those are wet cell batteries?

  41. Joel Ledezma on April 14, 2021 at 12:42 am

    We would like to see the wiring. Why he just connected the orange (positive?) to the UPS only? Where does the "negative" go?

  42. Zubair Khan on April 14, 2021 at 12:45 am


    Have you considered going with a lithium battery pack

  43. Cheefus Smith on April 14, 2021 at 12:46 am

    Terrific video! I’ve been wanting to do this too. Perfect garage/shed project. Cute kid 🙂

  44. Justin Clevenger on April 14, 2021 at 12:46 am

    I know this is an old video, but you can calibrate the ups to those batteries. I found that out with two apc units I have. Just have to unplug let it run on it’s normal load untill it is dead and re-charge. My one 1000Va was only telling me 7 minutes after I upgraded it’s batteries, but now it shows 45 minutes which is still less but closer to real time. Enough time for me to get out the generator. Just something for you to try to get a better remaining time display.

  45. Fox_gaming on April 14, 2021 at 12:47 am

    can i use a lifepo4 batteries with a bms on a ups?

  46. youratlanteon friend on April 14, 2021 at 12:48 am

    I did this and the terminal zapped me is their ac going to the battery’s? I thought they were dc, are they?

  47. T L on April 14, 2021 at 12:49 am

    Lamest video ever. Didnt even demonstrate run time.

  48. Dason Louthan on April 14, 2021 at 12:50 am

    How well would this work with say a super bank from xspower ?

  49. pete konne on April 14, 2021 at 12:50 am

    hello mike. great video but i have one slight problem. I have the same unit and have it set up the same way. I need something to last a long time to keep my coal stove running. I’m gone 10 hours a day and if the power goes out, the stove is out. so I wanted to see how long it would last on battery power. when i unplugged it from the wall it went to battery power. The time meter was at 55 minutes. after about an hour the meter went to 0 and the unit shut off. Had a volt meter on the battery;s and still showed 25.4 volts. put my battery charger on the battery’s. it took only 5 minutes to bring the battery’s back up to full charged. Turned unit back on and the meter said 0. So I put the original battery’s back in the unit and let it charge. the next day I did the same routine to see how long it would last. It lasted about an hour, the battery meter counter went to 0 and the unit shut off.. I took the battery’s out of the unit and tested with volt meter. Both battery’s still were charged at 24 volts. My question is ,,,,, is that meter some kind of memory timer that will only let the unit operate for a certain amount of time and is there any way to reset it or shut it off.. Give it a try and see if this happens to yours. Any help would be a great help. Thanks Ed.

  50. Mainta Man on April 14, 2021 at 12:51 am

    Tq. Klau pkai batery long hours only apc hanya sepuluh jam tv boleh dihidupkan, kipas dan lampu. I try apc 1000w. My house no electricity supply i need lamp, fan and television. And small else.

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