5A Charger & Voltage Adjustment

[Pete1961]

I am looking for a 5A charger with a variable voltage adjustment. I need to take 22s 1p of Ni Zn cells to 1.96V each, Thus 43.1V. I have been offered this charger @ 4.5A with the ability to have set the voltage as I wish but not then change it. Also it is available to order with or without a cut off at a particular voltage
http://www.ebay.co.uk/itm/36V-1-8A-2-5A-4-5A-Scooter-Lithium-Battery-Charger-8AH-18AH-Lifepo4-Li-ion-Ebike-/321438597401?pt=UK_Sound_Visi
My questions are 1) should I specify the pack max voltage I need or should this be a little above the desired pack voltage (Ni Zn needs to be charged at 0.5C as much as possible). I will have a Hi voltage alarm on the pack to tell me when the desired voltage is reached.
2) Should I go for the cut off or not (this sort of hinges on Q1, again there is the alarm)

I also found the Gaozhao charger http://endless-sphere.com/forums/viewtopic.php?f=14&t=59549 The 48V model is discussed here, pic seem,s to show a voltage adjustment pot. There is a 36V nominal version, I think sold by sun thing
http://www.ebay.co.uk/itm/36V-5A-LiFePO4-Battery-Charger-Electric-Bike-Kit-110V-or-220V-Scooters-Outdoor/141128189969?_trksid=p2045573.c100033
I contacted sun thing, he says the charger is not adjustable (& said to be 45V) - this may have been a mis understanding with him thinking I wanted to charge different nominal voltages rather than make a slight adjustment. Does anyone have a 36V Gaozhao?

I have an option of 8Ah or 10Ah batts, as they need 0.5C charging, the charger availability will denote which battery I get, need a bit of advice here. Pete

 

[dogman dan]

Ping or EM3ev. 5 or 6 amps. Both have voltage and amperage adjustment pots. Worth the price. I have 6 years now on my ping, and two on my EM3ev one.

If you want to have half charge, 90% and 100% selections, the one from EM3ev has a three voltage switch, and each choice has some range of adjustment. I have mine set for 14 s lico, with the top two at 4.1v and 4.18.

 

[Pete1961]

Thanks for that, Dogman, I will give both serious consideration. I take it either of the 5A Nominal 36V EM3ev chargers are the same one just set up for that particular batt chemistry.I am thinking if the Ni Zn thing did not pan out I still have a universal charger that I could use for Li ion or lipo4 nominal 36V
Re my last post a mistype by the batt supplier has been cleared up, all 36v batts are 23 cell (website showed 23 - he mentioned 22 in email after asking closely of my present set up) He also stated cut off @ 43.12V - this led me to divide 43.12 by 22 (hence the erroneous 1.96v per cell) Actually comes out @ 1.874V / cell or roughly 1.9 as Powergenix also advise (& squares with a graph on his website) Shows how much can be lost in translation. Pete