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Old Nov 19, 2003, 8:07 AM   #1
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Default duracell charger and time charge.help please!

hi from italy
i've a problem and i hope you can help me.
i have a duracell multicharger (aaaa,aa,c,d,9v battery) mopdel CEF11E:
220-230v ac 50hz 8w output dc 2x(2,8-440MA) 2x(9v-15ma).
the instructions show that:
- AA duracell batteries 1800 mah have a time of charge of 7 hours
- "..charger switch off after 7 hours for each battery type and transfer to 'top up' charge except 9v batteries which are chrger for longer periods (14 hours)..."
- ".. for aa,aaa,c,d or 9v size batteries, the led will light up in red showing charging progress.when the batteries are fully charged, the light will turn to green indicating the 'top up' charge is on.the charged battery are ready to use.."
-each other informations are not important
my questions now is:
- i think if i use 1800 mah empty batteries i have to do a simple charge of 7 hours (until the charger turn off), otherwise if the batteries are not empty i have to do a charge until the light is green (the charger turn off after 7 hours).
but if i want to use 2100 or 2300 mah batteries (for example), how can i do? maybe first charge of 7 hours until the charger turn off and a second charge after until the light is green?
- if the batteries are full and the charger go on until 7 hours, could i cause damage to batteries or charger?

thanks for all answers and sorry for my bad english and the lenght of the topic
stefano
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Old Nov 20, 2003, 11:30 AM   #2
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The time of charge (approximately 7hours) is not done with a clock, but by testing the battery voltage. So put in the bigger batteries and it will just take proportionately longer to charge them. The charger will switch itself to low current trickle charge (green led on) automatically when finished. You can leave the batteries in as long as you like afterwards. VOX
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Old Nov 21, 2003, 9:31 AM   #3
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Default ok, but...

thanks voxmagna for your reply.
i will follow your instructions but there is a problem that i didn't write(sorry):
in the intructions there is a summary table like this:

CHARGE TIME FORDURACELL NIMH BATTERIES
TYPE CAPACITY CHARGING TIME
AAA 750mah 7 hours
AA 1800mah 7 hours
C 2200mah 7 hours
.......
9V 150mha 12 hours

it's for this that i have dubts.
do you confirm me that you wrote yuor last reply?
bye
stefano
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Old Nov 21, 2003, 9:39 AM   #4
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Default sorry!!!

vox erase my last reply please!!!
i understand now (2 minutes after posting my reply). i though in wrong mode.
thanks a lot vox
bye
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Old Nov 23, 2003, 9:10 PM   #5
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OK. The figures in your table are probably 'approximate', so I would not rely too much on them.

The AAA cells are a special case. Because they are physically small and cannot get very hot, the charge current may be deliberately reduced and the time increased. Regards VOX
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Old Nov 26, 2003, 2:42 AM   #6
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Stefano, you mentioned charging batteries which are not empty. As far as I know, it's better to deplete NiMH batteries completely before charging them again. Not that I understood why though, as I hear this new NiMH batteries generation have no memory, and yet many people say that the early charging shortens batteries life. What am I missing?
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