Maybe it now possible to change the charging end voltage (3,6, 4,2, 4,35V) without opening the charger. It's crazy, that the feature is inside and not changeable without removing the screws.
Anyone find it officially from Opus? I looked over their alibaba pages, and couldnt find a BT-C3400.
Just emailed Robert ( rdana from ebay)
This is what he said……
The BT-C3400 is essentially the C3100 V2.1. This model number is exclusive to me.
Thanks,
I’m gonna buy one from him since it is the new 2.1 version.
Thank you, Electrified, for doing the leg work and getting us all a good answer.
This group buy ENDED mid Sept. I tried contacting gearbest on oct 1st but they will not honor the price.
Oh, sorry, I didn’t know. You are correct, I just checked.
Edit: Just now, the OP3100 coupon (promotion) code still works for a net price of $42.
perhaps I interchanged the codes, they should be:
v2.0 - gb3100 for $36
v2.1 - btc3100 ($45), this code no longer used
v2.1 - op3100 - code to be used for $42
So, there is no group buy for BTC-3400 this time :bigsmile:
Good. My BTC-3100 is still in waiting for final delivery from the post office. Maybe I’ll receive it in 1-2 days.
I’d better kill myself if there is already another groupbuy for a newer version even before I receive my BTC-3100 2.1 |(
Confirmed by Henry Xu from his reply to email inquiry.
Is the BT-C3400 still considered a relabeled BT-C3100 v2.1?
Yes
Anyone have a link to where i could download the manual for the C3100/C3400?
Thanks, now I’ll be able to read up before my BT-C3400 arrives (by Saturday).
Ended up ordering the BT-3100 with the European ac/dc power adapter (KYT120300BV), come with a Euro/US add-on adapter, which I guess I lost.
Where in the USA can I order a replacement AC/DC power unit, for my BT-3100?
(I would rather just get the whole power unit, and not have to use the euro/US adapter)
No matter what I try I can’t get my BT-C3400 to give me the mAh on the batteries, it just gives me 4 dashes (- - - -)?
Dumb question, but are you waiting for the test cycle to finish? Until it fully charges, then dicharges the cell, there is no mAh readout.
KuoH
…unless the 3400 has some other code issues not present in the 3100.
This unit requires =significant= patience. Even at higher rates, it can take 3 hours to discharge and 4 hours to charge for todays 3,xxx mah cells. The best you can do is 2 amp charge and 1 amp discharge. Do the math 
I think it’s my lack of patience that is the issue.
Its a shame Kreisl did not answer your question on CPF.
Re: XTAR VP4 verses OPUS BT C3100
just rebranded?Originally Posted by ShineOnYouCrazyDiamond
the BT-C3400 is the same as the BT-C3100 v2.1 just re-branded
i don't think so.
C3400 and C3100v2.1 are very similar, that's true. there are differences, i can't detail.
Moose and squirrel, together again. :)
