Vanson BC-1HU charge current for AA cells

blr

Newly Enlightened
Joined
May 8, 2005
Messages
18
I just made some obsevations regarding the charging current of my Vanson BC-1HU (speedy box) when charging AA cells. The maual says that the charging current is 500 mA, but my calculations show that it is about 700 mA. First I charged 2 Sony 700 mAh NiCd cells. It took 1h 8 min from flat. The discharge capacity at 550 mA load was close to 700 mAh. This is impossible to obtain at 500 mA charge current even if we assume 100% charging efficiency (1.13h x 500 mA =567 mA.
Same thing with Sanyo 1700 mAh cells. It took 2h 34 min and I could discharge ca 1600 mAh from them at 700 mA load.
It looks like despite the manual claim the charging current is 700 mA even for AA cells. This makes sense since the safety timer is reported to be set at 5 hours for AA cells. At 5 hours the new 2500 mAh cells will end up undercharged because the charging efficiency is less than 100%. I wonder if the engineers at Vanson didn't change their newer units to make sure they can handle the new high capacity cells. My unit is relatively new. Anybody else can comment?
 

3rd_shift

Flashlight Enthusiast
Joined
Mar 9, 2004
Messages
3,337
Location
DFW. TX. U.S.A. Earth
I have 2 of those chargers. (which I'm very happy with btw /ubbthreads/images/graemlins/wink.gif )

From what it looks like, I would have to agree that some minor changes were made for the newer Vanson units.
I got mine a year ago.
 

blr

Newly Enlightened
Joined
May 8, 2005
Messages
18
[ QUOTE ]
3rd_shift said:
I have 2 of those chargers. (which I'm very happy with btw /ubbthreads/images/graemlins/wink.gif )

From what it looks like, I would have to agree that some minor changes were made for the newer Vanson units.
I got mine a year ago.

[/ QUOTE ]

What do you think is the charging current on your units when dealing with AA cells? Let's try to ellaborate on when was the charger changed. Mine is less than two weeks old.
 

3rd_shift

Flashlight Enthusiast
Joined
Mar 9, 2004
Messages
3,337
Location
DFW. TX. U.S.A. Earth
I have had some AA nimhs take several hours to charge.
I think mine was rated at 400 ma charge rate when I got them.
The cutoff timer is definitely longer than 5 hours with my older units.
 

blr

Newly Enlightened
Joined
May 8, 2005
Messages
18
I chacked the sticker on the back of the unit. It says that charging current for AA, C and D cells is 700 mA. The lot# is 0205, which I read as manufactured this year (05). Apparently the charging current of the newer units has been increased to allow faster charging of the new high capacity cells.
 

Latest posts

Top