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Old March 29th 12, 12:55 AM posted to rec.radio.amateur.antenna
Tuuk[_3_] Tuuk[_3_] is offline
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First recorded activity by RadioBanter: Oct 2011
Posts: 72
Default Batterycharger ??

Nice work Sal

Thats what I am talking about. I knew you had it in ya.

I decided to buy a smart charger, the

http://www.adorama.com/ANCE8.html?ut...ource=dealtime

I bought it from a different source at much cheaper the price online
including shipping to my door.

While my other rigs are 1970ish, the HT is mostly for local stuff, the boat,
the company channels, the marine band and the grs bands. Very handy
actually, and practical because programable for a lot of uses. Once it was
opened up.

Thanks for the feedback, sorry for the off topic question and always
appreciate your expertise on here. 73s




"Sal" wrote in message ...

" Tuuk" wrote in message
...

snip

These batteries measure all 1.38 volts when charged pretty consistantly
and 1.17v when depleted, other than that I cannot measure the efficiency
of the charger to predict time of charge, according to the manufacture it
should be 9.9 hours, according to the math 3000mha devided by 360 ma of
the unit says 8.3 hours to charge full capacity.


Math always works but it won't give you a good answer if you use bad
numbers.

Here's what I mean: Yes, 360 mA times 8.3 hours equals approximately 3000
mAh but you have overlooked a widely-acknowledged rule for recharging:

Charge at 0.1C for about 16 hours, where "C" is the nominal capacity.
Using that rule, you charge a 3000 mA-h cell at 300 mA for 16 hours. (A
battery maker may impose or recommend something else. I'm parroting what
I have picked up.)

Not all the energy is stored by chemical conversion. Some is lost as
heat, which explains why you need to run the charger longer than you
calculated. (9.9 hours gets you closer but I bet they want to stop short
of a maximum charge to avoid having the cells vent.)

Some support for my views, plus helpful advice he
http://www.powerstream.com/NiMH.htm

"Sal"