Yes. The battery can be put in parallel or series by customers. But there are few tips we need to pay attention
1> pls Make sure the voltage of each battery are same before put in parallel. If they are not the same, charge them to the same rate.
2> Don't not put discharged battery and un-discharged battery in parallel. This may reduce the capacity of the whole battery pack.
3> Advise us the target capacity of the whole battery pack if you would like to put them in series. We will choose the suitable BMS for each battery.
4> If you are not professional connecting in parallel and series batteries, please don't handle the battery by yourself.
It may cause danger and shorten the circle life of battery pack.