WEX Deal: Save 500 on the Sony A7R Mark II

Re-charge times


DAVID LYDIATE 18 305
4 Aug 2006 8:11PM
How long does it take for 4 AA bats to recharge, so far they have been in 6hrs so far (batteries Uniross Recgargeable2500mAh Ni-MH)

How long would it take for Canon350D bat to recharge?

Join ePHOTOzine for free and remove these adverts.

sillyconguru 15 4.4k
4 Aug 2006 8:19PM

Quote:How long does it take for 4 AA bats to recharge


It depends on what charger is being used.


Quote:How long would it take for Canon350D bat to recharge?


1.5-2 hours?
DAVID LYDIATE 18 305
4 Aug 2006 8:26PM
The charger being used is X-Press 300 charger cost-19.99
Just to confirm I will use the charger that comes with 350D, which I presume is why you had an idea of the time.
sillyconguru 15 4.4k
4 Aug 2006 8:33PM
On the Mapilns website, someone asked a question about this charger:

Q) What is the Charging time?
A) AA 1300 mAh : 6hrs AA 2000 mAh : 9hrs AAA 600 mAh :7hrs PP3 160mAh : 11hrs

And you have 2500mAh batteries...
DAVID LYDIATE 18 305
4 Aug 2006 8:40PM
yes 2500mAh batteries, that time seems a little extreme though
How do you set up the 350D charger is it simple enough?
Can you use a normal bat for the 350d as well?
sillyconguru 15 4.4k
4 Aug 2006 8:41PM
Plug it into the mains socket and insert the battery.
DAVID LYDIATE 18 305
4 Aug 2006 8:44PM
Can you use a normal bat for the 350d as well?
sillyconguru 15 4.4k
4 Aug 2006 8:46PM
Basically....






No
geoffash26 16 2.5k United Kingdom
4 Aug 2006 10:54PM
2500mah charged at 2.5amps =1Hr
2500mah charged at 1.25amps =2hrs
2500mah charged at 250ma = 10hrs
1300mah charged at 650ma = 2hrs
etc etc


These times assuming the batteries are completely discharged

Over charging and charging batteries that are not completly flat does reduce battery profeciency(sp) over time

HTH
Geoff
Just Jas Plus
18 26.3k 1 England
5 Aug 2006 1:07AM
Well almost. There are losses due to heating (due to the internal resistance of the battery) which extends these charging times, given above by Geoff

Generally it is advantageous to charge at lower rates, which means less heating effect and therefor less outgasing of the electrolyte - which in turn extends the long term life of the battery.

Seeing as the heating losses are proportional to the square of the charging current, the lower charge rates are more efficient - energy in for energy out - though it takes longer.

A charger that takes overnight (16 hours) to completely charge the battery, at a lower rate, is probably best.

If you need them somewhat in a hurry then a 4 or 6 six hour charger will be a better option.

NiMH batteries have a lower internal resistance than nicads. Which makes them the preferred battery for use in cameras as they therefor run cooler for the same loading.

Which, in turn, makes them more efficient and safer in use.

jas
imagegrill 14 429
6 Aug 2006 11:20AM
I would recommend getting a microprocessor controlled charger for your AA batteries. This manages the battery charging better with regard to current supplied and heat generated by the batteries. The one I have (ansmann) will also fully discharge the batteries if you so wish.
Just Jas Plus
18 26.3k 1 England
6 Aug 2006 11:47AM
As an ex-engineer formerly involved with the design and quality of micro-processor controlled rectifier units (5.6KW) I thoroughly applaud this advice! LOL

jas

Sign In

You must be a member to leave a comment.

ePHOTOzine, the web's friendliest photography community.

Join For Free

Upload photos, chat with photographers, win prizes and much more.