[volt-nuts] volt-nuts Digest, Vol 24, Issue 19

[Marv Gozum @ JHN]

Concur, but trickle charging is even much less that 1/20th C.  Its 
really there to offset the self discharge rate.
I have had meltdowns with NiMH even to 1/10.  Duracell recommends 
1/300 C indefinitely.  If you charge at the traditional rates of 1/20 
to 1/30 C it will shorten the life of the cell or potentially cause 
them to boil over, albeit less violently than 1/10.  The best way is 
charge termination at ~ 1.25 then restart at 1.0V per cell or 
slightly earlier, and program this large into your charge algorithm.

http://en.wikipedia.org/wiki/Nickel-metal_hydride_battery#Trickle_charging



At 02:54 PM 8/22/2011, shalimr9 at gmail.com wrote:
>0.1C is not trickle charge, it is the normal charge rate for 14 
>hours recharge time.
>Most NiCad and NiMH batteries will not like that too much as a 
>trickle charge rate and will get and stay warm, at least those that 
>I have had experience with. The batteries in the HP 8116 function 
>generator were trickle charged at that rate and cause extensive 
>damage when they get tired of it. I have had better luck
>
>
>Trickle charge would be 1/10th or 1/20th of that.
>
>Didier KO4BB



Best Wishes,


Marv Gozum
Philadelphia