Re: Trickle charging NiCads

"RogerNutcase"


Hmmm. It looks as if there's no definitive answer. Would you say that
something like C/20 would be a reasonable compromise?

It would probably work just fine, nicads have pretty good life even when
continuously overcharged at c/10

** That is bull***.


It's obvious you don't know what you're talking about.


** So says a brain dead FUCKING LIAR.


Almost every cordless home device (phone, shaver, etc.) uses c/10 charging
for nicads. You can leave the phone on the cradle indefinately, battery
life is not as good as properly terminated charge but they still last a
few years.


** Much less, in most cases.

SO YOU LIE


You could probably make a design to charge at C/10 at lower voltage and
taper off the current as the battery voltage came up. Perhaps an
adjustable voltage regulator and a resistor, that way it would charge
faster after being discharged and charge at maybe c/20 at maybe 80%
charge. For example if you charged a 4.8V pack with a 5.8V power supply
and 10 ohm resistor, it would charge at 0.1A with the battery discharged
to 4.8V and the current would approach zero as the pack charge
approaches 5.8V. (assuming at 5.8V the pack was near full charge)


** Such a silly scheme will result in very long charging times AND the
cells will never reach full charge.

There is also the risk of charged cells heating and hence their voltage
dropping and hence the charge rate increasing on and on to destruction.



The right way is peak detection but that doesn't seem to be an option for
this application.


** That is no answer at all to my complaints - so you have lost the debate
already.

Clearly, you are know nothing damn fool.


My experience is with 28 years of flying R/C model planes and helicopters
where a battery failure means a crash.


** None of which is even slightly relevant to the original question.


I've learned most of what I know about charging from a battery
manufacturers former battery expert, manufacturer information,
microcontroller battery chargers, battery charger chip data sheets and
application notes.


** Not very interested where you got all your wrong ideas from.

But maker's mostly anonymously authored data sheets, pseudo technical
wankers posing as "experts " for scumbag import operations & ridiculous
software routines embedded in uCs by autistic code scribbling morons are an
* inexhaustible supply * of rechargeable battery bollocks.

Piss off.


...... Phil


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