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-   -   Sub-C NiCd's with Different capacities (https://www.rcuniverse.com/forum/batteries-chargers-84/11646092-sub-c-nicds-different-capacities.html)

RC_Fanatic 03-28-2018 06:11 PM

Sub-C NiCd's with Different capacities
 
Was cycling a couple of sub-C NiCd batteries used in my glow driver, typically 1700SCR's. Had a couple of other sub-C's that came with on-board glow drivers. Surprised that they tested at around 3,000 mAhr. Went online and found that such capacities are available. (Initially thought my cycler was bad!) What are the trade-offs for the higher capacity?

tntpooof 03-29-2018 01:29 AM

only trade off is your lower mah Nixx will have less starts.than the higher mah Nixx.

jameighan 03-29-2018 04:53 AM


Originally Posted by RC_Fanatic (Post 12417120)
Was cycling a couple of sub-C NiCd batteries used in my glow driver, typically 1700SCR's. Had a couple of other sub-C's that came with on-board glow drivers. Surprised that they tested at around 3,000 mAhr. Went online and found that such capacities are available. (Initially thought my cycler was bad!) What are the trade-offs for the higher capacity?

I think that the only way one can get more mAhr out of the cell without changing it's enclosure size is to increase the surface area of the cell electrodes by utilizing thinner electrode foil and reduce the separator thickness. This would be the same for NiMH cells also. If the charge rate is at C/10 and the charge cycle stops on the negative peak, cell life should be the same as lower rated mAhr cells which can tolerate higher charge rate currents.

At least that is how I understand the cell construction,
Jim Meighan


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