From Newsgroup: sci.electronics.repair

I have an older Cyperpower 550VA where I just replaced the traditional
12V lead acid battery. Since I've had great success with 12V lithium
ion batteries over the years, I've wondered what would be involved to
use Li ion instead of lead acid?

A little online investigating shows this being done, but looks pretty
costly if going the commercial route. On the other hand, safety is a
factor especially indoors.

Thoughts and suggestions appreciated and thanks in advance.
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From Newsgroup: sci.electronics.repair

On 2026-03-19 11:22, George Garth wrote:

I have an older Cyperpower 550VA where I just replaced the traditional
12V lead acid battery.-a Since I've had great success with 12V lithium
ion batteries over the years, I've wondered what would be involved to
use Li ion instead of lead acid?

A little online investigating shows this being done, but looks pretty
costly if going the commercial route.-a On the other hand, safety is a factor especially indoors.

Thoughts and suggestions appreciated and thanks in advance.

I don't think the existing electronics in the unit can figure out things
like the amount of charge the battery has, what voltage to apply, when
to finish charging... Maybe analyze if the battery is running too hot
and is dangerous.
--
Cheers, Carlos.
ESEfc-Efc+, EUEfc-Efc|;
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From Newsgroup: sci.electronics.repair

George Garth <none@nowhere.com> wrote:

I have an older Cyperpower 550VA where I just replaced the traditional
12V lead acid battery. Since I've had great success with 12V lithium
ion batteries over the years, I've wondered what would be involved to
use Li ion instead of lead acid?

A little online investigating shows this being done, but looks pretty
costly if going the commercial route. On the other hand, safety is a
factor especially indoors.

Thoughts and suggestions appreciated and thanks in advance.

From what I've seen lithium iron phosphate is a near drop-in replacement
for lead acid. The exact voltages differ slightly from lead but if you
have access to the charge profile can be managed.

If you don't have access to the charge profile it's another matter.
LiFePO4 can be charged at 1C rates to 14.4-14.6 volts in a 4-cell
battery. For long durations, 13.8-14.0 V is considered desirable.
That's not wildly different from lead acid behaviro, but neither is
it identical. In particular the full-charge float current is apt
to be much lower for LiFePO4, leading to long-term overcharge.

Safetywise I'd say LiFePO4 is safer than lead acid. Neither is able
to self-ignite and the former isn't even corrosive. Both are equally
good firestarters 8-)

hth,

bob prohaska

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From Newsgroup: sci.electronics.repair

George Garth wrote:
I have an older Cyperpower 550VA where I just replaced the traditional
12V lead acid battery. Since I've had great success with 12V lithium
ion batteries over the years, I've wondered what would be involved to
use Li ion instead of lead acid?

A little online investigating shows this being done, but looks pretty
costly if going the commercial route. On the other hand, safety is a
factor especially indoors.

Thoughts and suggestions appreciated and thanks in advance.

If you end up doing this, I will be interested to here how it goes.

Thanks


This is a response to the post seen at: http://www.jlaforums.com/viewtopic.php?p=702707622#702707622
--
[via JLA Forums] sci.electronics.repair on the web: http://www.jlaforums.com/viewforum.php?f=91
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From Newsgroup: sci.electronics.repair

On 3/19/26 7:04 PM, MummyChunk wrote:

George Garth wrote:
I have an older Cyperpower 550VA where I just replaced the traditional
12V lead acid battery.-a Since I've had great success with 12V lithium
ion batteries over the years, I've wondered what would be involved to
use Li ion instead of lead acid?

A little online investigating shows this being done, but looks pretty
costly if going the commercial route.-a On the other hand, safety is a
factor especially indoors.

Thoughts and suggestions appreciated and thanks in advance.

If you end up doing this, I will be interested to here how it goes.

I won't be doing it. Seems too risky for me and I lack enough knowledge
in order to make the necessary circuit changes.

Thanks

This is a response to the post seen at: http://www.jlaforums.com/viewtopic.php?p=702707622#702707622

Thought that was a scam site. Went there and they wanted me to answer a question before showing me that page.


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From Newsgroup: sci.electronics.repair

On Thu, 19 Mar 2026 06:22:10 -0400, George Garth <none@nowhere.com>
wrote:

Since I've had great success with 12V lithium
ion batteries over the years, I've wondered what would be involved to
use Li ion instead of lead acid?

The real question is: Why would you want to? Which problem are you
trying to solve?

Lithium batteries age more quickly when they are kept at full charge,
while lead batteries age best when they yare kept at full charge.

Lithium batteries are lighter and smaller for the same amount of
energy, but for stationary use, it does not matter.

Lithium is, as you have found out, more expensive than lead.

For standby applications such as UPS and emergency lighting, lead-acid batteries are simply superior on all levels.
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From Newsgroup: sci.electronics.repair

From: none@no.no

On Thu, 19 Mar 2026 06:22:10 -0400, George Garth <none@nowhere.com>
wrote:

The real question is: Why would you want to? Which problem are you
trying to solve?

Lithium batteries age more quickly when they are kept at full charge,
while lead batteries age best when they yare kept at full charge.

Lithium batteries are lighter and smaller for the same amount of
energy, but for stationary use, it does not matter.

Lithium is, as you have found out, more expensive than lead.

For standby applications such as UPS and emergency lighting,
lead-acid
batteries are simply superior on all levels.

--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)

HW,
Are the batteries in Cellphones Lithium?

A friend has his cellphone connected to the A.C. line 24/7.
He asked me once thinking it was a bad idea and I told him I figured
the
charging circuitry would/should taper the charging level down after the battery
gets fully charged

Reading your post caused me to want to ask you about the battery in a cellphone.
Ed.
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From Newsgroup: sci.electronics.repair

On Tue, 31 Mar 2026 21:34:15, NOSPAM.Ed.Vance@darkrealms.ca (Ed Vance)
wrote:

Are the batteries in Cellphones Lithium?

Yes, they are.

A friend has his cellphone connected to the A.C. line 24/7.
He asked me once thinking it was a bad idea and I told him I figured
the
charging circuitry would/should taper the charging level down after the >battery
gets fully charged

Yes, all lithium chargers will stop when the battery is fully charged.
They have to, otherwise the battery will be damaged or even catch
fire.

But keeping the battery at 100% charge for a long time is "stressful"
for the battery. It is a time thing: The longer you keep it at 100%,
the harder it is for the battery.

Reading your post caused me to want to ask you about the battery in a >cellphone.

Most people replace their phone well before the battery is worn out,
so it's probably fine.

If you want your battery to last as long as possible, it is best to
not keep it fully charged for extended periods of time. Many phones
can be configured to charge the battery to some value, like 85%. Apple
have a feature where, if you have an alarm set, the phone will charge
to 85% and hold it there all night, and then fully charge the battery
just in time for the alarm time.

Some electric cars have a feature where you can tell it to charge the
battery to less than 100% for those days when you know you don't need
the full range.

My laptop computer has a similar feature, where I can configure it to
stop charging at less than 100%.

So, check if the phone has a battery save feature.
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From Newsgroup: sci.electronics.repair

On Wed, 01 Apr 2026 14:14:20 +0200, HW <none@no.no> wrote:

On Tue, 31 Mar 2026 21:34:15, NOSPAM.Ed.Vance@darkrealms.ca (Ed Vance)
wrote:

Are the batteries in Cellphones Lithium?

Yes, they are.

LiPo (Lithium Polymer).

A friend has his cellphone connected to the A.C. line 24/7.
He asked me once thinking it was a bad idea and I told him I figured
the
charging circuitry would/should taper the charging level down after the >>battery
gets fully charged

Yes, all lithium chargers will stop when the battery is fully charged.
They have to, otherwise the battery will be damaged or even catch
fire.

Agreed. That's the way it's suppose to work. However, I've seen a
few phones that don't know when to quit charging. If you're worried
about premature battery death due to failure to stop charging, you
might want to invest in a USB-C tester:
<https://www.ebay.com/itm/377011397649>
<https://www.ebay.com/itm/176782044275>
<https://www.ebay.com/itm/177920446131>
It also works with laptops and devices that use a USB-C charging
connector.

But keeping the battery at 100% charge for a long time is "stressful"
for the battery. It is a time thing: The longer you keep it at 100%,
the harder it is for the battery.

Reading your post caused me to want to ask you about the battery in a >>cellphone.

Most people replace their phone well before the battery is worn out,
so it's probably fine.

I've seen statistics claiming that the typical lifetime of a phone is
about 2.5 years. <https://nsysgroup.com/blog/average-device-lifespan-how-long-does-a-cell-phone-last/>
I don't believe that's correct. My Moto G Power (2020) is now about 6
years old. The Accubattery Pro app <https://play.google.com/store/apps/details?id=com.digibites.accubattery> declares that the battery health is now 80% of original battery
capacity. Here's my screen dump.
<https://photos.app.goo.gl/fgHMbAL6tshyAd657>
Internet wisdom suggests the battery will need replacement after it
drops below 80% of original battery capacity. For what it's worth, I
put my phone on charge when I go to sleep and leave it there until
morning, where the SoC (state of charge) always shows 100%.

Note: If the 2.5 year life test results included lost phone, damaged
phones, 3rd part junk batteries, fashion failure, feature envy and
other reasons to replace the phone, it might be correct. If the test
results included only battery failures, then I believe it's probably
too low.

If you want your battery to last as long as possible, it is best to
not keep it fully charged for extended periods of time. Many phones
can be configured to charge the battery to some value, like 85%. Apple
have a feature where, if you have an alarm set, the phone will charge
to 85% and hold it there all night, and then fully charge the battery
just in time for the alarm time.

Some electric cars have a feature where you can tell it to charge the
battery to less than 100% for those days when you know you don't need
the full range.

My laptop computer has a similar feature, where I can configure it to
stop charging at less than 100%.

So, check if the phone has a battery save feature.

--
Jeff Liebermann jeffl@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272 AE6KS 831-336-2558

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From Newsgroup: sci.electronics.repair

From: none@no.no

On Tue, 31 Mar 2026 21:34:15, NOSPAM.Ed.Vance@darkrealms.ca (Ed
Vance)
wrote:

Yes, they are.

Yes, all lithium chargers will stop when the battery is fully
charged.
They have to, otherwise the battery will be damaged or even catch
fire.

But keeping the battery at 100% charge for a long time is "stressful"
for the battery. It is a time thing: The longer you keep it at 100%,
the harder it is for the battery.

Most people replace their phone well before the battery is worn out,
so it's probably fine.

If you want your battery to last as long as possible, it is best to
not keep it fully charged for extended periods of time. Many phones
can be configured to charge the battery to some value, like 85%.
Apple
have a feature where, if you have an alarm set, the phone will charge
to 85% and hold it there all night, and then fully charge the battery
just in time for the alarm time.

Some electric cars have a feature where you can tell it to charge the
battery to less than 100% for those days when you know you don't need
the full range.

My laptop computer has a similar feature, where I can configure it to
stop charging at less than 100%.

So, check if the phone has a battery save feature.

--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)

Thanks HW,
My friend has had several phones quit working on him.
He probably will continue doing as he has.

Myself, I charge this phone while asleep each night.
Ed
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From Newsgroup: sci.electronics.repair

In article <775011076@darkrealms.ca>, NOSPAM.Ed.Vance@darkrealms.ca
says...

A friend has his cellphone connected to the A.C. line 24/7.
He asked me once thinking it was a bad idea and I told him I figured
the
charging circuitry would/should taper the charging level down after the battery
gets fully charged

I have my cell phone charging most all the time. I may pick it up once
or twice when I go out. Retired so around the house most of the time.
I use a landline for almost all the calls. Never had a problem with the cellphone battery that I can recall in 10 years of using a couple of
updated phones.
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