Maha C9000/WF-139 vs Vision Peak Ultra

[Rzr800]

Found this charger (unopened) http://www.dynamiterc.com/Products/Default.aspx?ProdID=DYN4053 that I purchased some time ago for a budding RC interest that never really took off as expected. Could somebody please tell me if this is a better quality and more accurate unit than the Maha MH C9000 that I just purchased for Eneloops and if I'd be better off with the recently received WF-139 for my 14500 and 18650 Li-ions?

I dug up some great info from silverfox as to the compatibility of Li-ions in this "Li-Po" unit ( http://www.candlepowerforums.com/vb/showthread.php?t=168961 post#2) yet wanted to know if the two chargers that I am presently using aren't already the very best (my reason for posting this) for these two applications in consideration of what I (now) have.

Thanks in advance if anybody can help.

 

[SilverFox]

Hello John,

Looking at the specifications, I would say that it is superior to the WF-139.

Looking at nickel chemistry charging, it is different from the C-9000. It can charge a single cell, or a series string of cells. The C-9000 can charge 4 cells independently. The C-9000 and discharge cells, the other charger can't. However the other charger offers a higher charging rate than the C-9000.

Both can run from AC or DC.

Without testing the Dynamitrec unit, I can't venture a guess as to which is more accurate, or which unit does a better job of charging cells.

Tom

 

[rizky_p]

IMHO they are quite a different charger all together, Vision peak is for anthusiast market such as RC fans while Wizard one was meant for mainstream users.

Being a Hobby charger it has many features, flexibility and (usually)better accuracy compared to mainstream charger eg. wizard one.
I have WF-139 and hobby charger(Imax B6, Hyperion EOS0606i AD, Maxpro X6) i would normaly use WF-139 to charge 18650 and CR123, it is just easier to charge compared to hobby charger with that aligator clip. If i want to charger faster then i use hobby charger since charging 18650 in WF-139 takes alot of time.

Unfortunately the charger doesnt have discharge function which really important if you still running Ni-Mh or Ni-CD. There are much better charger and more features currently than Vision Peak in the market at that price range(Triton Jr, FMA cellpro 4S, Imax B5, Hyperion 5i to name a few)

thanks.

 

[Rzr800]

You two are both fantastic and I am certainly indebted for the time you took to answer this in detail with all the information that I needed. It appears as if I can simply set this aside until needed for the string-type RC cells and use the discharge/recharge functions in the Maha to properly exercise my growing collection of Eneloops over time (I'd buy a better quality charger for the Li-ions; yet I'm beginning to get the feeling that the WF-139 is just fine if you keep an eye on both it and the cells themselves).

Can't thank you both enough once again.

 

[rizky_p]

No problems, glad the infos are usefull.

In my opinion WF-139 is an OK charger as long as you keep an eye on it and do a commong sense in charging with ANY lithium chargers. Never had any over-voltage with my WF-139 so far even being left for hours, some has over-voltage but mine doesnt. All the batteries(unprotected) charged measured 4.20v sharp on my DMM and stays the same even the next morning.

 

[Rzr800]

"..All the batteries(unprotected) charged measured 4.20v sharp on my DMM and stays the same even the next morning..."

The few times that I have charged my protected Li-ons on the WF-139 they have measured spot on also with no variation. Thanks again.

 

[rizky_p]

The few times that I have charged my protected Li-ons on the WF-139 they have measured spot on also with no variation. Thanks again.

Well unless if you charged a slightly damaged battery, it wont go to 4.2v mark it will be lower.

 

[Rzr800]

Well unless if you charged a slightly damaged battery, it wont go to 4.2v mark it will be lower.

http://www.candlepowerforums.com/vb/showthread.php?t=161820 (post #8; others)

I'm not arguing with you; as I know nothing about these chargers and am using a DMM that fluctuates between 4.1 and 4.2 (I posted the larger value and really need to find a better meter).

Thanks for letting me know.