$37.99 for Opus BT-C3100 V2.1 with OP3100 ( clearance) & $38.99 for Opus2.2 without using the coupon @GearBest

ordered

Hello LSX,

I will confirm this with Opus, I will let you know once I get that info, thanks for your support :party:

Thanks! I will definitely get one if that plug is available.

Does this do LiFEPO4 charging also? Their description says “3.7 Li-FeO4”.

Also, if yes, does that have to be selected with the same internal switch you mentioned, and then do all 4 bays only do LiFEPO4?

Me too…

Ok, so can we reprogramm v2.0 units with new v2.1 firmware if we have a programmer?

hmm, i was thinking about ordering another charger before the previous GB was ended, but never did.
i’d prefer to wait for HJK’s updated review as well though…
you never know if they have fixed one thing but broken a couple of other things :wink:

whole-heartedly recommend this unit .If you buy cheap batteries off ebay ,you just test them and send a message with your test results .No joke two orders(£21) refunded instantly(batteries kept),and one vendor when i contacted him telling him his batteries were ace and pushing 5200mah instead of usual 4400mah ,he replied very sorry can i refund you £2 and you keep batteries.
needless to say i didnt accept his £2. BUt my point is even if they cant translate the english the opus bt-c3100 stands out bold to them and they dont dispute issues. this tool pays for itself in no time, and also helps identify great priced genuine batteries on ebay,ali express etc.
Talking of ali express
brought four zoomie flashlights £2 each shipped. advertised as 18650/3aaa.
when i got them they only take the aaa’s .
so dispute opened and cost me £1 each in end.
plus spotted a skyray 3x cree,+4battteries+charger .£5.50
its on its way according to vendor. big mistake, as of yet unspotted.

I was in a buying mood and just bought one.

Hoping for a good review now

Looks like the price on the C3100 v2.0 went up to 39.00. Can anyone else confirm?

Yes, I just tried the coupon code and it’s $39, but should be $36 as stated in the OP. We’ll have it checked tomorrow as it’s 9:39pm now in Shenzhen, office is closed.

Do we know if the fan is quieter now? He says there's a new fan cover, but does that effect the noise?

Henry Xu sent me two pre-production samples of the v2.1.
Pic below is the pre-production v2.1 (notice the 2.1 upon start-up on the screen). The pre-production version does not have the new logo of OPUS on the current production version printed on the upper right of the charger casing, and can be seen in the OP.
!!
Below is the Charge capacities of the same cells I tested in the v2.0, this time the v2.1 on the left powered by a 15A regulated PSU and the v2.1 on the right powered by the stock psu. Notice the very small differences between the readings from the 15A psu and the Stock PSU. which was one of the issues of the earliest version of the 2.0, but was later on corrected in the later 2.0 deliveries as mentioned by Henry Xu.
!!
Below are the Discharge readings using the stock psu, to be compared to the small variances to the Charge readings on the pic above.
!!

I have also tested a purple Samsung ICR18650-28 4.35v cell. Unfortunately I can no longer find the pic but I can confirm that it was charged to 4.35v in 3:39 hour to 2789mah,
2:49 hrs. to 2799mah in Discharge mode
which was one of the major gripes in the 2.0 for having a very long charging time when 4.35v charging is selected.

Also the fan was more reactive to temperature changes, turning on and off as needed.

Yes, the fan is quieter on the 2.1, and as pointed out to Henry, you will notice that the new fan now has three-leg bracket for a more rigid fan protection against mis-alignment against the shroud.

!!

Will this have UL/CE logo and reference number?

I doubt it would make it quieter based on cover alone. IT was the fan itself that was making the noise i think.

!!

!

Henry has mentioned about a new lubricant in one of his previous posts in the gb thread but I can’t find it now. He has been aware of the fan noise complaints.

Think going to order this with batteries. What’s the difference between the blue and red 26650 6000mah tangsfire batteries?


Not only the charger, the power plug does also show a CE logo.