Quick comment about initial battery use (whatever you decide to buy).
When I installed ours I quickly wanted to establish range so ran the battery pretty much out on the first few charges; I am sure others are tempted the same way.
I now see this is exactly what is NOT recommended. You should always try to keep the battery at least 20% full (lots of references say that), and especially for its early use you should probably keep it higher than that (I can't find the references right now, may be rubbish advice)
Good info at https://batteryuniversity.com/index.php/learn/article/how_to_prolong_lithium_based_batteries The smaller the discharge (low DoD), the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often between uses. Partial discharge on Li-ion is fine. There is no memory and the battery does not need periodic full discharge cycles to prolong life. The exception may be a periodic calibration of the fuel gauge on a smart battery or intelligent device. (See BU-603: How to Calibrate a “Smart” Battery)
E bike project advice and help
Re: E bike project advice and help
If you were to get the max ah/capacity out of a typical battery the DOD would be down to 2.8v per cell however generally the BMS has a LVC ( low voltage cutoff ) which is usually at or about 3.3 - 3.4v.
Below 3.3V there is little capacity left maybe 3 or 4% at most. It is the same with the top end, between 4.1 - 4.2v again there is little capacity and only accounts for < 5%.
When I'm out for a long run I will use the batteries full capacity down to LVC, often I will parallel two batteries together and they will provide greater range and longer lasting power.
Below 3.3V there is little capacity left maybe 3 or 4% at most. It is the same with the top end, between 4.1 - 4.2v again there is little capacity and only accounts for < 5%.
When I'm out for a long run I will use the batteries full capacity down to LVC, often I will parallel two batteries together and they will provide greater range and longer lasting power.