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>> Home > Forum > Electrical Related > 1.5v AA Li-Fe/Li-ion/Li-po batteries
1.5v AA Li-Fe/Li-ion/Li-po batteries
(291 views)
Author Message
EricMB
(Commander)





Forum Posts: 23
26th Aug 2018 22:40  
>> Permalink
mdlbt.com/45458

Hi all, has anyone any experience of using these new 1.5v batteries? There are some that appear ‘normal’ in terms of charging, and a new breed of batteries with a micro usb slot in the top, needing a special usb charger. Any info appreciated before I order some!
Thanks, Eric

onetenor
(Fleet Admiral!)





Forum Posts: 380
27th Aug 2018 00:06  
>> Permalink
mdlbt.com/45463

Where are they from. Any piccies?👍

RNinMunich
(Fleet Admiral!)





Forum Posts: 2224
27th Aug 2018 02:13  
>> Permalink
mdlbt.com/45466

Yes, I'd like to know that too!
Please post links where you found them.
I'm intrigued by batteries which seem to contradict the chemistry used in them😲
LiFe (LiFePo4) cells have a nominal voltage of 3.2V.

Li-Ion have a nominal voltage of 3.6 to 3.85 V,
They are a derivative of LiFe, which simply defines the metals used in the positive terminal; lithium + a Ferrous compound and carbon.
Used in electric cars, military and aerospace.

LiPo (Lithium Polymer) have a nominal cell voltage of 3.7V.
They are also a variant of LiFe. The 'polymer' part simply refers to the material of the separator used to prevent electrode particles passing from from one to the other. It only allows Ion exchange, i.e. current flow. Hence in effect you can regard all of these rechargeable Lithium types as 'Li-Ion' batteries.
Used in Laptops, notebooks, mobile phones / tablets etc, and of course RC models😉

There ARE 1.5V Lithium batteries, Li-FeS2, BUT they use Lithium metal as the anode and are NOT rechargeable!! Nominal voltage 1.4 -1.6V.
Used as a high current, long storage life substitute for alkaline AA and AAA cells providing about two and a half times the energy of the alkaline. Similar not rechargeable chemistry, using other compounds of manganese (most common), copper, iron to name but a few, is also used in typical 3V Lithium button cells.

1.5V rechargeable suggests to me an alkaline battery, produced by RAYOVAC some years ago. I still have a few of their C size cells kicking about. Don't have a very good 'power to weight ratio' compared to modern LiPos though.🤔
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
RNinMunich
(Fleet Admiral!)





Forum Posts: 2224
27th Aug 2018 11:41  
>> Permalink
mdlbt.com/45477

OK, found some!
https://www.ebay.com/itm/8pcs-JUGEE-3000mWh-1-5V-rechargeabl...
Interesting that they all quote mWh instead of mAh! I.e. energy instead of capacity! Power being V x I (Amps) divide the mWh rating by the nominal voltage to get an approximation of the capacity in mAh. Saves integrating across the varying voltage during a discharge cycle, i.e.'On Load' 😉
Thus these 3000mWh cells seem to have a capacity of around 1800mAh.
Which is considerably less than the typical 2500mAh of an alkaline or NiMh AA cell.
Also, to produce the output voltage of 1.5V from 3.7V Lithium chemistry the cells have an internal voltage regulator, which also must consume some power, albeit miniscule. Something else which can go wrong🤔
Summary; yer pays yer money and takes yer choice!
Seem rather expensive to me for what they deliver.
Depends what you want to use them for.
Might be useful in my Sony camera but I wouldn't use them for any high current load in a model. OK perhaps for LED lighting circuits which only need a few tens of mA.
Here a list of battery types, sizes and chemistries for reference.
https://www.wikiwand.com/en/List_of_battery_sizes#/overview
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
onetenor
(Fleet Admiral!)





Forum Posts: 380
29th Aug 2018 22:57  
>> Permalink
mdlbt.com/45562

Thanks Doug that echoes my thinking too.Also weighty in comparison as well. If IRCC there are rechargeable button cells now somewhere. Have to be charged in stacks of 4 I believe.

RNinMunich
(Fleet Admiral!)





Forum Posts: 2224
29th Aug 2018 23:09  
>> Permalink
mdlbt.com/45563

Hi John,
Yep, I heard that too.
Don't see any real advantage though. Button cells are cheap enough (keep 'em in the fridge to hold their capacity longer) and it's a lot of faffing about and ANOTHER charger!😲
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
onetenor
(Fleet Admiral!)





Forum Posts: 380
30th Aug 2018 21:41  
>> Permalink
mdlbt.com/45607

Charger needs to be any suitable WALL WART IIRCC👍

RNinMunich
(Fleet Admiral!)





Forum Posts: 2224
31st Aug 2018 00:06  
>> Permalink
mdlbt.com/45613

Yet another wart in the wall!? I'm runnin' out of wall sockets as it is!😲
Lost track of how many times the circuit breaker has tripped 🤔
G'night all, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!