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Old 22-02-2014, 16:53   #1
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Junsi Celllogger connections

Finally got the Junsi today. I thought it would have a plug to connect but it only has 9 pins.
Does anybody know where I can get a plug so that I can connect it to my 4 cell LiFePO4 pack?
Thanks
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Old 22-02-2014, 18:21   #2
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Re: Junsi Celllogger connections

Quote:
Originally Posted by folivier View Post
Finally got the Junsi today. I thought it would have a plug to connect but it only has 9 pins.
Does anybody know where I can get a plug so that I can connect it to my 4 cell LiFePO4 pack?
Thanks
They are made by JST or Japan Solderless Terminal. I got mine from Newark:

Plug = JST - XHP-5 SKU# 74M5180

Terminals = JST - BXH-001T-P0.6 SKU# 73M9274


Buy plenty of extras because the shipping will cost more than the product... You can also order the JST pre-made plugs from Hobby King but I find them pretty crappy with 7" leads that then need butt splices. I prefer to crimp and make my own harness and use slightly larger gauge wire.

The biggest issue, in making your own, is you will need a crimp tool that can crimp these very miniature JST terminals. Oh and your reading glasses too.

To crimp I used my Molex HTR-2262-A crimp tool but I am sure JST has a more specific tool. My Molex made beautiful work of it but I have 40 some odd crimp tools to choose from so I just kept trying my small D-Sub tools until I found one that worked....

Please don't count on the Cell Log 8S to be accurate. IMHO it is a good at a glance guide only. I own two of them and find them pretty inaccurate and they also tend to drift. I have countless hours trying to calibrate both of them to agree with my Flukes, or any other DVM for that matter, and they simply won't... Two bad ones in a row? Perhaps, but doubtful.... I suspect like most things inexpensive and Chinese I simply got what I paid for. Very cool product, just lacks accuracy...
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Old 22-02-2014, 18:56   #3
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Any model airplane - car - boat shop has these style of connectors.
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Old 23-02-2014, 09:27   #4
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Re: Junsi Celllogger connections

These are what you need.

JST-XH 5S Wire Extension 20cm (10pcs/bag)

Just cut the other end off and splice into your battery cells.

Cheers,

CJ
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Old 23-02-2014, 09:33   #5
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Re: Junsi Celllogger connections

Thanks, I was able to find the pigtail from Newegg.com
BTW it took over a month to receive the Junsi from Hobbyking Malaysia.
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Old 06-03-2014, 22:41   #6
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Re: Junsi Celllogger connections

The Junsi is accurate enough down to the second decimal place, give or take 0.01v. Now seriously, if you are watching the cell voltages that closely, why the hell did you buy a boat in the first place. Within 0.05v per cell is so many powers more accurate than reading average terminal voltages were in the past it's a case of close enough is good enough really, these batteries are a lot tougher than that, they don't need cotton wool, they need to get out there and do what they were made for, pumping energy both in and out, they'll love you for it. Stay between the 2.8v and 3.6v if you want long cycle life, that doesn't mean the odd trip down to 2.75v and up to 3.65v is going to drastically shorten their cycle life.
If you have plans to leave them to your grand kids as part of their inhertance, then min cell voltage isn't what you should be watching any way, stop at 30% SOC, I doubt you will out live them then.

T1 Terry
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