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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Charge voltage question
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Charge voltage question - 4/20/2008 8:55:43 PM   
WLB


 

Posts: 71
Joined: 2/11/2002
From: Waterloo, IA, USA
Status: offline 		I recently thought I would try a two cell Tenergy li-on 900mah pack for a lightweight rx application. The cells are marked RCR123A 3.0v LI-On. I have made the switch to all true A123 type cells but these Tenergy cells are marked at 3.0v and as I recall that is a different voltage than I have seen referred to for my "regular" A123 cells I have several Orbit Pocketladers and they can be adjusted to what ever charge voltage I choose but I am not sure where to start. Thanks for any help.

< Message edited by WLB -- 4/20/2008 10:05:39 PM >
       Post #: 1

RE: Charge voltage question - 4/21/2008 4:33:36 PM   
SilverFoxCPF


 

Posts: 58
Joined: 1/5/2008
From: Bellingham, WA, USA
Status: offline 		Hello WLB,

I am not totally sure about the Tenergy cells, but most of those cells are a normal Li-Ion cell with a circuit that reduces the voltage around 0.7 volts. They get their 3.0 volt rating by taking the nominal 3.7 volt Li-Ion rating and drop it by 0.7 volts. If this is the same circuit that is used in the Tenergy cells, the charger has to be set to accommodate this difference in voltage.

A normal Li-Ion cell will be charged to 4.2 volts. The chargers, that I am aware of, used for these "3.0 volt" cells, charge the cell up to 4.6 - 4.9 volts.

You can convert these cells to normal Li-Ion 3.7 volt cells by removing the shrink wrap and circuit at the bottom of the cell. Then you can treat them as a normal Li-Ion cell.

At high current discharges, don't expect long cycle life. I have seen some of these cell loose over 20% of their capacity in as little as 10 cycles at 2C. I am not sure how well the Tenergy cells perform.

Tom

(in reply to WLB)
       Post #: 2

RE: Charge voltage question - 4/21/2008 6:09:43 PM   
WLB


 

Posts: 71
Joined: 2/11/2002
From: Waterloo, IA, USA
Status: offline 		Hi Tom,
Upon further examination you are absolutely correct as there is a well hidden circuit under the outer heat shrink. I have removed it and will do some charge/discharge tests to see how they perform. i will be using them in a combat airplane for rx so I do not think they will pull high loads. Thanks again.
Wayn e

< Message edited by WLB -- 4/22/2008 4:20:18 PM >

(in reply to SilverFoxCPF)
       Post #: 3

RE: Charge voltage question - 4/22/2008 1:34:38 AM   
SilverFoxCPF


 

Posts: 58
Joined: 1/5/2008
From: Bellingham, WA, USA
Status: offline 		Hello WLB,

Let me know how they test out. I have never been able to get any of the R-CR123 cells to test out much over 600 mAh under a 1 amp load. 900 mAh seems a little bit high.

Tom

(in reply to WLB)
       Post #: 4

RE: Charge voltage question - 4/22/2008 4:22:46 PM   
WLB


 

Posts: 71
Joined: 2/11/2002
From: Waterloo, IA, USA
Status: offline 		Tom,
After removing the circuit board these cells are even smaller. I do not think they will produce 900 mah. I will let you know.
Wayne.

(in reply to SilverFoxCPF)
       Post #: 5

RE: Charge voltage question - 4/23/2008 4:32:44 PM   
WLB


 

Posts: 71
Joined: 2/11/2002
From: Waterloo, IA, USA
Status: offline 		They cycle at about 500 mah so I have written them off as an educational experience.

(in reply to WLB)
       Post #: 6

RE: Charge voltage question - 4/25/2008 11:04:40 PM   
SilverFoxCPF


 

Posts: 58
Joined: 1/5/2008
From: Bellingham, WA, USA
Status: offline 		Hello Wayne,



Tom

(in reply to WLB)
       Post #: 7

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