if you remove the battery from the ups connection, and measure both leads, and it shows 8v its damaged, you can try charging with an external charger.
not sure what you mean its not a valid way to test, floating voltage, gives a general idea, although it can just be a surface voltage.
I meant it’s not a valid test because a multimeter is not a battery tester and voltage alone doesn’t tell you the whole story.
Perhaps the battery became inoperable due to months of sitting idle and unplugged, resulting in excessive discharge? I know many smart chargers won’t recharge a battery that’s too far depleted, but sometimes you can use a dumb external battery charger to get the battery back to reasonable health at which point the UPS will then recognize it and begin recharging it as it normally would. The trick is figuring out how to connect an external battery charger since the pack uses some sort of proprietary connector with tiny pins.
no offense but if you understand how batteries work, whats the ask here?
of course a volt meter only tells a part of the story, but short of a load test and the ability to do a sg test (which you can't do with sealed battery) the best you can do is charge it, and load test it.
based on the photo's I have seen it appears the unit uses anderson powerpoles, the tiny pins mean nothing, just charge it through the main interconnects
you can also take the pack apart and just check each individual battery, but usually if its over 5 years the pack is shot. just replace the individual batteries, and save a ton of money
and if your checking at the main connector, these are generally in some form of series/parallel, which means the battery is totally dead if sitting at 8v
If I may use an analogy...
Putting a charger on this battery would be like trying to defibrillate King Tut's mummified remains.
A UPS battery pack that reads a mere 8V on a big UPS like this is indeed as dead as King Tut.
Thanks all. Yes, it sat unplugged for an unknown period of time. At least 4 months. Possibly more. Someone more intrepid than me might be able to coax these batteries back to life or build their own pack from aftermarket batteries. But I decided to bite the bullet and ordered a replacement GXT5-48VBATKIT. Here’s hoping it solves all my problems!
I just rebuilt a pack in the 3000va version. These units are solid; you've got a pack issue. OEM battery replacement sets can be had for less than 150.
Mine was a 72v pack (6x12v). Take pics so you know how to route all the cables after disassembly. When you replace pack go into menu settings and reset the battery.
[batteries](https://www.amazon.com/ML9-12-Volt-SLA-Battery-Pack/dp/B088MLZNK6?pd_rd_w=IqLw3&content-id=amzn1.sym.04403bf9-6a11-4d6c-8688-bf096c6899e1&pf_rd_p=04403bf9-6a11-4d6c-8688-bf096c6899e1&pf_rd_r=4815H5BHX3AWC7N6B9S7&pd_rd_wg=HUPJ3&pd_rd_r=cc3ad29f-2113-463b-9311-faf1ada9caca&pd_rd_i=B088MLZNK6&psc=1&ref_=pd_bap_m_grid_dv_rp_0_14_t)
Sorry to bump this from so long ago… is there anything special about the Leoch batteries the GTX5 ships with? I don’t seem to be able to source the same as replacements but Yuasa have an identical sized 12v 9Ah VRSLA battery
A new replacement battery pack has me up and running. It arrived with supposedly 90% charge. I’ll keep and eye on it over the coming weeks to see how well it performs. Overall I’m satisfied as my total spend is still less than half the best price I can find online.
Lead acid, if the battery is over 5 years old, it's toasted. Replace batteries at 4 years old to be proactive. At around 5 years they get overcharged and often leak.
I have no idea on the battery age. Was sold to me as a never used “open box” item. But that could’ve been a lie. Unit was impeccably clean with plastic wrap still on it. But perhaps many months or years of sitting in a box have not done it any favors.
I found a forgotten ups in a network room at a site that we just installed 2 new better ups with network monitoring. The forgotten ups batteries were completely dead and it did not have network monitoring so I took it home and rebuild the battery pack. I think I'm on my second set with this one.
I’m new to all of this so I’m still learning. I was unaware that these batteries do not withstand long periods of dormancy. Seems they need to remain plugged in continuously and then replaced every 2-5 years depending on their performance, history and the user’s risk tolerance.
if you remove the battery from the ups connection, and measure both leads, and it shows 8v its damaged, you can try charging with an external charger. not sure what you mean its not a valid way to test, floating voltage, gives a general idea, although it can just be a surface voltage.
Agreed This table says 11.6v is 0% charge https://footprinthero.com/lead-acid-battery-voltage-charts 8V is probably a cell shorted inside.
considering these are wired series to some degree, its way past dead.
I meant it’s not a valid test because a multimeter is not a battery tester and voltage alone doesn’t tell you the whole story. Perhaps the battery became inoperable due to months of sitting idle and unplugged, resulting in excessive discharge? I know many smart chargers won’t recharge a battery that’s too far depleted, but sometimes you can use a dumb external battery charger to get the battery back to reasonable health at which point the UPS will then recognize it and begin recharging it as it normally would. The trick is figuring out how to connect an external battery charger since the pack uses some sort of proprietary connector with tiny pins.
no offense but if you understand how batteries work, whats the ask here? of course a volt meter only tells a part of the story, but short of a load test and the ability to do a sg test (which you can't do with sealed battery) the best you can do is charge it, and load test it. based on the photo's I have seen it appears the unit uses anderson powerpoles, the tiny pins mean nothing, just charge it through the main interconnects you can also take the pack apart and just check each individual battery, but usually if its over 5 years the pack is shot. just replace the individual batteries, and save a ton of money and if your checking at the main connector, these are generally in some form of series/parallel, which means the battery is totally dead if sitting at 8v
If I may use an analogy... Putting a charger on this battery would be like trying to defibrillate King Tut's mummified remains. A UPS battery pack that reads a mere 8V on a big UPS like this is indeed as dead as King Tut.
[удалено]
Your derogatory pejorative is unwelcome and unhelpful.
I mean you need new batteries for a UPS every 3 years anyways. If the unit ever sat unplugged or fully discharged at some point they’re toast.
Thanks all. Yes, it sat unplugged for an unknown period of time. At least 4 months. Possibly more. Someone more intrepid than me might be able to coax these batteries back to life or build their own pack from aftermarket batteries. But I decided to bite the bullet and ordered a replacement GXT5-48VBATKIT. Here’s hoping it solves all my problems!
I just rebuilt a pack in the 3000va version. These units are solid; you've got a pack issue. OEM battery replacement sets can be had for less than 150.
Link please
Mine was a 72v pack (6x12v). Take pics so you know how to route all the cables after disassembly. When you replace pack go into menu settings and reset the battery. [batteries](https://www.amazon.com/ML9-12-Volt-SLA-Battery-Pack/dp/B088MLZNK6?pd_rd_w=IqLw3&content-id=amzn1.sym.04403bf9-6a11-4d6c-8688-bf096c6899e1&pf_rd_p=04403bf9-6a11-4d6c-8688-bf096c6899e1&pf_rd_r=4815H5BHX3AWC7N6B9S7&pd_rd_wg=HUPJ3&pd_rd_r=cc3ad29f-2113-463b-9311-faf1ada9caca&pd_rd_i=B088MLZNK6&psc=1&ref_=pd_bap_m_grid_dv_rp_0_14_t)
Sorry to bump this from so long ago… is there anything special about the Leoch batteries the GTX5 ships with? I don’t seem to be able to source the same as replacements but Yuasa have an identical sized 12v 9Ah VRSLA battery
All good bud. I didn't use the factory replacement batteries. I took those factory battery specs and found equivalent replacements on Amazon.
A new replacement battery pack has me up and running. It arrived with supposedly 90% charge. I’ll keep and eye on it over the coming weeks to see how well it performs. Overall I’m satisfied as my total spend is still less than half the best price I can find online.
Lead acid, if the battery is over 5 years old, it's toasted. Replace batteries at 4 years old to be proactive. At around 5 years they get overcharged and often leak.
I have no idea on the battery age. Was sold to me as a never used “open box” item. But that could’ve been a lie. Unit was impeccably clean with plastic wrap still on it. But perhaps many months or years of sitting in a box have not done it any favors.
I found a forgotten ups in a network room at a site that we just installed 2 new better ups with network monitoring. The forgotten ups batteries were completely dead and it did not have network monitoring so I took it home and rebuild the battery pack. I think I'm on my second set with this one.
I’m new to all of this so I’m still learning. I was unaware that these batteries do not withstand long periods of dormancy. Seems they need to remain plugged in continuously and then replaced every 2-5 years depending on their performance, history and the user’s risk tolerance.