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RTC backup with Lithium Battery (charge)

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neuralc

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charging lithium cr2032

Hi all,

Some have experienced a circuit to charge a 3v lithium coin cell (like CR2032), that backups an RTC (connected to Vbat and ground) in a 5V supplied application?

ThX

NeuralC
 

HARDCORE

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cr2032 charging circuit

charge a 3v lithium coin cell (like CR2032) ???

I dont think that you can charge a standard Litiumcell .

see ya
 

dainis

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cr2032 alternatives

HARDCORE said:
charge a 3v lithium coin cell (like CR2032) ???

I dont think that you can charge a standard Litiumcell .

see ya
Danger of explosion if recharging is attempted !!!
 

velislav

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charge cr2032

Yes, dainis, I know that.
But, as you say "Danger of explosion if recharging is attempted !!!"
So, I tried to suggest an alternative in the same 2032 package...
 

engraxate

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cr2032 with rtc

Hi
Take a look at DS1302 and DS1305 at maxim's web site.
 

neuralc

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charging cr2032

Hi all,

Thanks for everything.

I have in mind to use ST M41T00, and I have automatic battery backup switch on power down.
Searching better I found a page: h**p://www.st.com/stonline/products/support/memory/nvram/bl_data/rtc.htm
to calculate th life time of battery, with CR2032 (210 mAh) I get > 20 years!!

We should not recharge CRXXXX lithium coin cells...


ThX

NeuralC
 

dainis

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battery crxxxx 5v

ST M41Txx is good RTC, I also it using ...
 

glasstire

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lithium battery rtc

FWIW, if you ever need very small LiMnO2 rechargeable, both Sanyo and Panasonic have the ML414.
 

gabby

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rtc what meaning battery back up

neuralc said:
Hi all,

Thanks for everything.

I have in mind to use ST M41T00, and I have automatic battery backup switch on power down.
Searching better I found a page: h**p://www.st.com/stonline/products/support/memory/nvram/bl_data/rtc.htm
to calculate th life time of battery, with CR2032 (210 mAh) I get > 20 years!!

We should not recharge CRXXXX lithium coin cells...


ThX

NeuralC

Hi
First i can think that you can't get : "I get > 20 years!!"
1. because the standart LIMnO2 battery have a internal lose capacity 0f 5%
per year and also in function of temp.
2. the supplier give you out of date of the battery that is ~5-10 years
over that date they can work maybe? but no guarante.


E.g.
For that that say that you can't recarge a 2032 size battery
the 2032 are the size of the battery
of corse most of them are LIMnO2 ~210mah that can't be recharge
but laso avaliable in that size Li-Ion battery that you can charge with
capacity of ~35 mAh


Best regards.
 

dainis

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cr2032 charging

gabby said:
neuralc said:
Hi all,

Thanks for everything.

I have in mind to use ST M41T00, and I have automatic battery backup switch on power down.
Searching better I found a page: h**p://www.st.com/stonline/products/support/memory/nvram/bl_data/rtc.htm
to calculate th life time of battery, with CR2032 (210 mAh) I get > 20 years!!

We should not recharge CRXXXX lithium coin cells...


ThX

NeuralC

Hi
First i can think that you can't get : "I get > 20 years!!"
1. because the standart LIMnO2 battery have a internal lose capacity 0f 5%
per year and also in function of temp.
2. the supplier give you out of date of the battery that is ~5-10 years
over that date they can work maybe? but no guarante.


E.g.
For that that say that you can't recarge a 2032 size battery
the 2032 are the size of the battery
of corse most of them are LIMnO2 ~210mah that can't be recharge
but laso avaliable in that size Li-Ion battery that you can charge with
capacity of ~35 mAh


Best regards.
Please read original post, where NeuralC wrote about Lithium cell CR2032, but not LIMnO2 !!!
 

gabby

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rtc coin lithium battery

Hi dainis.

When i say "LIMnO2 battery " i mean that is the chimestry of the CR2032
battery.

For the understand when say Lithium battery they are few kinds of battery
but the main chimical is the Lithium for example:


types of Lithium battery:

* Mannganese Dioxide (LiMnO2) - the popular Lithium, non recharging battery (avaliable also type ml that is recharging)
* Sulfur Dioxide (LiSO2) - special for military and aerospace.
* Tyonil clorid (LiSOCl2) - special high capacity battery lost cap 1% pear year.
* Lithium-Ion Polymer - recharging lithium battery
* Lithium-Ion - popular use in computhers phone etc recharging lithium battery.


all of these battery called lithium battery

Please repair me if i am wrong :p

Best regards 8)
 

dainis

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cr2032 rtc charging

Sorry .....

Dainis
 

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