There seems to be limited availability for some batteries at the moment. (EU)
So, what are the needed specifications? Those did not come by me clearly at available guides.
What I gather is that batteries should be unprotected and flat-topped, but what else?
Should they have a certain minimum continuous or maximum discharge current or charging rate?
Voltage should be something around 3.6-3.7?
Bonus question: Capacity is up to personal desire I guess, but as user Biffo1262 noted ( Configuration details lost - #5 by Biffo1262 ), their Samsung 35E cells disliked cold weather more than original Bosch battery, so what would you recommend for nordic winters?
I currently have a Bosch gen2 performance line cruise motor, if that matters, but possibly using my Gouach for something else at some point.
Just to reinforce my findings. Yesterday it was warm and the battery performed extremely well. Distance 28 miles on pretty flat terrain with light winds on an out and back course the battery showed 71% charge immediately on return. Five hours later at rest the battery now shows 77% chargeā¦a 6% increase whilst at rest. This has not changed throughout the Winter and into the warmer Spring weather. The more charge used the greater the anomaly. Now whilst it was impossible to accurately state what the original Bosch battery did exactly, it never once showed an increased capacity at rest post ride on the LED indicators on the battery. I ended the ride yesterday with 3 led lights lit on the Infinite and five hours later 4 led lights are glowing. My worry is will the battery cease to output at the āliveā indicated charge or will it continue to work using the āhiddenā capacity the appears later when at rest? This hidden capacity has been over 12% previously which is quite a large percentage of the charge to lose if it ceases on indicated state of charge. Is it the BMS or the type of battery (Samsung 35E)? My findings on the Infinite are still positive overall though there are some minor issues that arise where they donāt using the OEM Bosch. Firstly as described above plus it changes power modes randomly after about 15 miles onwards into the ride but always increased power which I can cope with. It also goes to Turbo mode when stopped for a few minutes. Something isnāt 100% compatible but it isnāt a great issue. Defaulting to OFF rather than Turbo when climbing really WOULD be cause for concern though.
Lithium batteries recover some charge when allowed to rest because of the ārelaxation effect,ā where ions redistribute within the cell after the load is removed, causing the terminal voltage to rise. This is not a true increase in total capacity, but rather a redistribution of active chemicals that makes the battery temporarily usable again. [1, 2, 3]
Key Reasons for Recovery:
Relaxation/Diffusion: During high use, lithium ions cannot move fast enough to keep up with demand, creating a deficit at the anode. Resting allows these ions to diffuse, normalizing the chemical reaction and boosting the voltage.
Surface Charge Reduction: When heavily used, a batteryās voltage drops sharply due to high demand (voltage sag). When the load stops, this āsurface chargeā disperses and stabilizes, often causing the voltage to increase slightly.
Cell Balancing: In multi-cell packs, if the battery was shut down because one cell fell below the cut-off voltage, resting allows the internal Battery Management System (BMS) to balance the cells, allowing a slightly higher voltage reading later.
Temperature Effects: Chemical reactions in batteries occur faster when they are warmer. As a battery cools down after being used (or heats up slightly), its voltage can shift.
It just seems to be rather more pronounced with these Samsung 35E cells.
Iāve might have felt this ārelaxationā in action with some camera gear and a headlamp, but was possibly coining it with using these equipment in cold weather and then warming them indoors or in a pocket to regain their juice.
I ended up ordering Molicell P28A after reading good reviews of their performance in low temperatures. Their datasheet also lists discharge temperature for -40 to +60 Ā°C, where as datasheet for Samsung 35E is listed for -10 to 60 Ā°C. If I understand correctly, at page 5 section 7.5, Samsung datasheet states that 35E only has 40 % of their capacity at -10 Ā°C.
Molicell P28A has a little less capacity at 2800 mAh, but I accept that as it should in this theory take me to places around the year with more consistency. It also has a whopping 35 A maximum discharge current that might get handy when using these cells for something else - and I hope using smaller percentage of their capability extends their life as well, like having big enough PSU for your computer.
Thanks for the info. I had come to the conclusion my issue is cell related and the 35E wasnāt the best choice for my local Winter climate. Fortunately my original Bosch battery can cover my cold weather riding for now. I just donāt feel inclined to write off 40 35E cells just because of their poor cold weather performance. I am just happy to have realised exactly what the issue is and there is no blame attributed to the Infinite system itself. I am actually perfectly happy to have proved all the doomsayers wrong about weld free batteries. It has my fullest confidence.
The 35E are generally seen as a high quality cell, possibly only lacking cold temperature performance. I think it can get quite cold in France as well, but 35E are something used as an example cell here.
My Molicel batteries arrived, and I now understand that the cell type (as a model) should be selected when configuring Infinite Battery at setup.
At this respose rate I do not know how long it would take to get my Molicel P28A included to that list. What does the jury say, do I cause an explotion or kill just the batteries if I select another cell from the list? Iād really like to stop paying for public transport.
I did not reach this point of configuration yet, as I have to make way for my bosch style connector plate to mate with the aluminium casing. Iāll make an other thread about that.
