Alexp
May 2, 2014, 10:22pm
161
The charger is oscillating and stops the charging a bit too prematureThis has been solved by firmware update: charger will make no current increase back in the CV stage. So no oscillating at all circumstances.
2.The “resting”/overheating periods during 2A charging or 4 × 1A discharge
2A charging is supposed to be used for high capacity Li-ion batteries, we should mention this in user manual that charging with ni-mh AA batteries with 2A charging current is not appropriate. Since 1A discharge current for 4 pcs li-ion batteries will generate a lot heat, and the fan exhausting speed is not fast enough.So it can lead to thermo-protection kicked in, which this safety mechanism is designed for. So I hope it is acceptable. If only two batteries is discharged at 1A speed, it should be no problem.
3. Power spikes from the power supply
4. Uses trickle charging for NiMH when cell is fully charged
Henry? What do the owners of BT-C3100 V.1?
CircaM
May 5, 2014, 2:53am
162
I want to go from my hobby charger that charges 1 cell at a time to a 4-cell at once charger . is this "the charger" to get to replace my hobby charger?
tatasal
May 5, 2014, 3:10am
163
I have both a hobby charger and the C9000. Although a hobby charger and the C9000 have more choices in charging/discharging rates, this one can analyze 4 cells at a time, individually. No need for outboard cradles too.
So has anyone done any experiments using this charger to charge 4 18650 batteries to 4.35 volts?
Alexp
May 7, 2014, 9:28am
165
Who among developers can ask questions? Prompt .
pipifax
May 7, 2014, 9:34am
166
I found this article interesting:
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday"). Each period consists of 12 hours numbered: 12 (acting as 0), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. The 12-hour clock was developed from the second millennium BC and reached its modern form in the 16th century.
The 12-hour time convention is common in several Eng...
xmint
May 7, 2014, 9:59am
167
A hobby charger can charge many more than one cell at a time. I have done 8 in parallel before now and 6 in series with a basic hobby charger
xmint
May 7, 2014, 10:06am
168
tatasal:
I have both a hobby charger and the C9000. Although a hobby charger and the C9000 have more choices in charging/discharging rates, this one can analyze 4 cells at a time, individually. No need for outboard cradles too.
Are the ‘analyzed’ results consistent between the different slots on your one?
tatasal
May 7, 2014, 10:21am
169
Do you mean the BT-C3100? I have not received it yet if that’s what you mean.
xmint
May 7, 2014, 10:39am
170
Yes sorry should have been clearer, the *C3100. Oh thought they would have sent you one first!
Always found it finicky making sure the contact pressures and resistance were the same/similar while checking cells to make sure the results were consistent. So with production tolerances was wondering how it worked in practice with production examples of the BT-C3100.
tatasal
May 7, 2014, 11:47am
171
xmint:
Yes sorry should have been clearer, the *C3100. Oh thought they would have sent you one first!
Always found it finicky making sure the contact pressures and resistance were the same/similar while checking cells to make sure the results were consistent. So with production tolerances was wondering how it worked in practice with production examples of the BT-C3100.
Henry Xu, its designer, said the IR figures of the are just ballpark figures, considering the sliding/contact pressures differences are inherent in such a design that accommodate multi-length cells… He also said this charger is not a high-dollar precision instrument and 100% accuracy in the IR cannot be expected. As to the consistency of results, a lot of chargers has this sliding design so, IM0, it should be as good, if not better.
xmint
May 7, 2014, 11:36am
172
tatasal:
Henry Xu, it’s designer, said the IR figures of the are just ballpark figures, considering the sliding/contact pressures differences are inherent in such a design that accommodate multi-length cells… He also said this charger is not a high-dollar precision instrument and 100% accuracy in the IR cannot be expected. As to the consistency of results, a lot of chargers has this sliding design so, IM0, it should be as good, if not better.
I know it was going to be ballpark, that’s why I asked about the consistency of a production version’s results.
If doing 4 at a time were going to be really useful then it would have to have consistent results between the slots.
Am not interested in this as a charger, but as an analyzing host I might be interested.
Chloe
May 7, 2014, 11:40am
173
If you are measuring internal resistance with it, do sets of repeated tests as I did to find the average. I did not notice any gross variation between slots on my sample.
xmint
May 7, 2014, 11:51am
174
Cheers for that Chloe :bigsmile:
Chloe in your review you had written regarding the hidden switch to charge to 4.35 volts that there would be more on this later. I am very curious about this possible ability but I have failed to find information from anyone trying that charge level. Have you experimented with this or know anyone that has?
Chloe
May 7, 2014, 6:08pm
176
Mountain Prophet did test it and it will charge to 4.35V, but discharge termination voltage is still 2.8V:http://www.mountainprophet.de/2014/03/15/preview-akkulader-opus-bt-c3100/
Shucks. Thanks Chloe, you saved me some money.
Just cause I’m curious, what’s the problem with the charger for you?
Any one know what the differences between V2.0 and V2.1 are? This ebay seller seems to have V2.1 units…VERSION 2.1
kuoh
May 12, 2014, 3:04am
180
Wow, $44 shipped including C & D adapters! Even says I can get it by Tuesday. Very tempted and I haven’t even received the one from GB yet.
KuoH