Does anyone have any experience swapping out old lead-acid batteries for Li-ion equivalents in a UPS? I see these batteries advertised as replacements, but I'm concerned about their safety in this application. New Li-ion UPS systems seem to be extremely expensive.
Li-ion UPS battery substitution in UPS
Started by ●October 18, 2022
Reply by ●October 18, 20222022-10-18
On Tuesday, October 18, 2022 at 11:43:44 AM UTC-4, Bert Hickman wrote:> Does anyone have any experience swapping out old lead-acid batteries for > Li-ion equivalents in a UPS? > > I see these batteries advertised as replacements, but I'm concerned about > their safety in this application. New Li-ion UPS systems seem to be > extremely expensive.I've seen the charging methods indicated as being similar, constant current, constant voltage, then a topping charge. But lithium ion batteries do not tolerate a float charge. Even if this wasn't an issue, the details of current and voltage will not be the same. I would not expect the lithium batteries to live very long being charged as lead acid. -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209
Reply by ●October 18, 20222022-10-18
On Tuesday, October 18, 2022 at 8:43:44 AM UTC-7, Bert Hickman wrote:> Does anyone have any experience swapping out old lead-acid batteries for > Li-ion equivalents in a UPS? > > I see these batteries advertised as replacements, but I'm concerned about > their safety in this application. New Li-ion UPS systems seem to be > extremely expensive.I added some Li cells to my dying LA battery. Yes, there is LA in EV. However, i have to be careful not to over-charge it for extended period of time. I disconnect it during extended usage, when the LA can handle the load. Unlike LA, Li does not like to be fully charged.
Reply by ●October 18, 20222022-10-18
tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman:> Does anyone have any experience swapping out old lead-acid batteries for > Li-ion equivalents in a UPS? > > I see these batteries advertised as replacements, but I'm concerned about > their safety in this application. New Li-ion UPS systems seem to be > extremely expensive.might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible LiFe4 should also be bit safer the Li-ion
Reply by ●October 18, 20222022-10-18
On Tuesday, October 18, 2022 at 9:05:08 AM UTC-7, lang...@fonz.dk wrote:> tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman: > > Does anyone have any experience swapping out old lead-acid batteries for > > Li-ion equivalents in a UPS? > > > > I see these batteries advertised as replacements, but I'm concerned about > > their safety in this application. New Li-ion UPS systems seem to be > > extremely expensive. > might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible > > LiFe4 should also be bit safer the Li-ionYes, i use 4S (3.2V x 4) LiFePO4 and 3S (3.7V x 3) LiPo.
Reply by ●October 18, 20222022-10-18
On Tuesday, October 18, 2022 at 9:11:53 AM UTC-7, Ed Lee wrote:> On Tuesday, October 18, 2022 at 9:05:08 AM UTC-7, lang...@fonz.dk wrote: > > tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman: > > > Does anyone have any experience swapping out old lead-acid batteries for > > > Li-ion equivalents in a UPS? > > > > > > I see these batteries advertised as replacements, but I'm concerned about > > > their safety in this application. New Li-ion UPS systems seem to be > > > extremely expensive. > > might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible > > > > LiFe4 should also be bit safer the Li-ion > Yes, i use 4S (3.2V x 4) LiFePO4 and 3S (3.7V x 3) LiPo.BTW, i am using some old 12V module based on the TI BQ20Z95 and some new one based on BQ20Z65. Half of the BQ20Z95 doesn't work or cut-off at low 11V. BQ20Z65 works better, but still cut-off at around 11.5V or sometimes lower, even with all new cells. For emergency, i put 32 to 34 of them in series to run at 400V.
Reply by ●October 18, 20222022-10-18
On Tuesday, 18 October 2022 at 18:05:08 UTC+2, lang...@fonz.dk wrote:> tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman: > > Does anyone have any experience swapping out old lead-acid batteries for > > Li-ion equivalents in a UPS? > > > > I see these batteries advertised as replacements, but I'm concerned about > > their safety in this application. New Li-ion UPS systems seem to be > > extremely expensive. > might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible > > LiFe4 should also be bit safer the Li-ionLiFe4 car batteries is old fake promoted by traders, which has never worked fine. LiFe4 is still Li-ion battery and should be avoided to not risk fire in your car. My friend offered me 80 used LiFe4 90Ah car batteries from his electric car, affected by pillow syndrome but I rejected to not risk my home demolished one day.
Reply by ●October 18, 20222022-10-18
On Tuesday, October 18, 2022 at 10:23:47 AM UTC-7, a a wrote:> On Tuesday, 18 October 2022 at 18:05:08 UTC+2, lang...@fonz.dk wrote: > > tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman: > > > Does anyone have any experience swapping out old lead-acid batteries for > > > Li-ion equivalents in a UPS? > > > > > > I see these batteries advertised as replacements, but I'm concerned about > > > their safety in this application. New Li-ion UPS systems seem to be > > > extremely expensive. > > might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible > > > > LiFe4 should also be bit safer the Li-ion > LiFe4 car batteries is old fake promoted by traders, which has never worked fine. > > LiFe4 is still Li-ion battery and should be avoided to not risk fire in your car.Yes, you need good BMS and manual disconnect.> My friend offered me 80 used LiFe4 90Ah car batteries from his electric car, affected by pillow syndrome > but I rejected to not risk my home demolished one day.Tell him to put it on ebay and give me a link here. I might get them if the price is right.
Reply by ●October 18, 20222022-10-18
On Tuesday, 18 October 2022 at 19:28:12 UTC+2, Ed Lee wrote:> On Tuesday, October 18, 2022 at 10:23:47 AM UTC-7, a a wrote: > > On Tuesday, 18 October 2022 at 18:05:08 UTC+2, lang...@fonz.dk wrote: > > > tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman: > > > > Does anyone have any experience swapping out old lead-acid batteries for > > > > Li-ion equivalents in a UPS? > > > > > > > > I see these batteries advertised as replacements, but I'm concerned about > > > > their safety in this application. New Li-ion UPS systems seem to be > > > > extremely expensive. > > > might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible > > > > > > LiFe4 should also be bit safer the Li-ion > > LiFe4 car batteries is old fake promoted by traders, which has never worked fine. > > > > LiFe4 is still Li-ion battery and should be avoided to not risk fire in your car. > Yes, you need good BMS and manual disconnect. > > My friend offered me 80 used LiFe4 90Ah car batteries from his electric car, affected by pillow syndrome > > but I rejected to not risk my home demolished one day. > Tell him to put it on ebay and give me a link here. I might get them if the price is right.Better turn your electric car into mobile 100 kWh UPS
Reply by ●October 18, 20222022-10-18
On Tuesday, October 18, 2022 at 10:53:36 AM UTC-7, a a wrote:> On Tuesday, 18 October 2022 at 19:28:12 UTC+2, Ed Lee wrote: > > On Tuesday, October 18, 2022 at 10:23:47 AM UTC-7, a a wrote: > > > On Tuesday, 18 October 2022 at 18:05:08 UTC+2, lang...@fonz.dk wrote: > > > > tirsdag den 18. oktober 2022 kl. 17.43.44 UTC+2 skrev Bert Hickman: > > > > > Does anyone have any experience swapping out old lead-acid batteries for > > > > > Li-ion equivalents in a UPS? > > > > > > > > > > I see these batteries advertised as replacements, but I'm concerned about > > > > > their safety in this application. New Li-ion UPS systems seem to be > > > > > extremely expensive. > > > > might look at LiFe4 instead, afaik you can get LiFe4 car batteries so they must be reasonably compatible > > > > > > > > LiFe4 should also be bit safer the Li-ion > > > LiFe4 car batteries is old fake promoted by traders, which has never worked fine. > > > > > > LiFe4 is still Li-ion battery and should be avoided to not risk fire in your car. > > Yes, you need good BMS and manual disconnect. > > > My friend offered me 80 used LiFe4 90Ah car batteries from his electric car, affected by pillow syndrome > > > but I rejected to not risk my home demolished one day. > > Tell him to put it on ebay and give me a link here. I might get them if the price is right. > Better turn your electric car into mobile 100 kWh UPSMine is essentially Li UPS. LA is too heavy.
