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Ah question answered after looking at this UK sellers listing. ON-BOARD Lipo BUZZER INDICATOR 1 to 6 cell METER UK | eBay Regards Jerry

Ok now the public health warnings are out the way :p Getting back on topic this little monitor/alarm looks interesting. Cheap and small enought to be left perm on my packs. It seems support both Lipo and LiFe packs ? Lipo battery Voltage Indicator voltmeter monitor Alarm | eBay I am not...

I want to just add a note of caution here mainly if you are thinking of building an ebike for a general user and encouraging them to use lipos as a power source. Whilst I am well aware that many of you are more than capable of charging and using Lipos safely, please be aware that these cells...

Interesting read Chris. I am not sure as you say if the OMG cells are genuine. That said I have found a video on Youtube that claims OMGs batteries are not genuine. I took the wrappings off and they seem to be match the battery he is holding. All a little confusing...

My motor tends to stop assisting after about 14-15mph, so I rarely engage it once I am around that speed. Regards Jerry

Interesting. I note the BM-6 is no good if you use A123 cells as the low voltage limit only goes down to 3.0v whereas the A123 cells go down to 2.0. The Cell-Log monitor looks like it might be good to leave permantly attached to my two 6s1p packs, though that might be over kill. But then they...

Scott, So do you split the packs down to charge them/have a couple of dedicated lipo charger/balancers ? The LiFePO4 chemistry is definately safer than Lithium Polymer (I have used lipos a lot in my RC hobby), remain in balance better, can cope better with under/over charging and can be left...

Yes thanks Scott. I have just finished the charge at work using the generic 36v, 1.6A charger. Clearly the balancing of the cells has helped as all the cells are much closer now on both 6s1p packs at around 3.4V. As you say I will do a few more charge/balance cycles with my dedictated LiFeP04...

Well good news today. Managed to get all the way to work without the cell failing. As can be seen in the graph the cell is running a little lower than the others but when it had been at rest for a few minutes after the ride, it was within 0.036v of the others. Hopefully it will fully recover :D...

Yep I use the CellLog device which is excellent and will even log voltages of individual cells during a ride. See more details here You can then use LogView to plot the results, see here Regards Jerry

Ok almost finished. Charged the 6s1p pack on my dedicated Lipo/Life charger and afterwards the cells were all about the same except cell 3, which was about 0.15V less than the others. I then put that cell on charge on its own and put in about another 0.7 Amps into it before it registered as full...

Yes I do but I tend to only use that sometimes usually at the beginning after I have built the batteries, otherwise I use a standard 36v 1.6amp charger as shown earlier in the thread. I am getting all the cell voltages in line as I speak. Regards Jerry

Maybe cycle helmets are worth wearing if you ride in Africa lol Regards Jerry

Thanks Scott. I was chatting with one of the electrical engineers at work. He liked my graphs. He has suggested charging the single cell extra on its own to make sure it is fully charged before I put any load on it. I think one of the problems is that I may have put the cell into the pack in an...

Well the same thing happened again this morning on the way to work. I definately put more load on the pack on way to work (it was very windy again) than on the way home. This time I caught it on the CellLog as shown below viewed in LogView. Again the blue line is the overall pack voltage and...

Here and Here Regards Jerry

Ok battery seemed to perform ok on the way home and cells were failry balanced (within 100mV) at the end with no errors :confused: Attached is the result from the CellLog displayed using the program LogView. Note the CellLog meter is attached to only one of the two 6s1p packs i.e. the one with...

I use two 6s1p packs connected together in series. I am pulling no more than 10 amps in any one burst and mostly only 6 amps. These cells are rated to something like continuous discharge of 30C, 69 amps (60C, 138 amp bursts!) so I am well within specs. The connections are fine. I suspect a...

Yes Pedalo I just read that the genuine ones will have A123 Systems stamped on the metal casing. I will check tonight. I think they are genuine. You can get even cheaper ones that are marked as DeWalt rejects. I have just recharged the pack and all seems ok. I will attach the CellLog and put...

I have a 15amp fuse on my Tongxin based Brompton. I tried a 10 amp but it kept blowing. I think you could safely come down to about 20amps. As stated Tongxin motors have to be treated with some care. They don't like being over volted or have heavy currents run through them. Regards Jerry