Charging two batteries vs one

[SP33]

So I have this portable charger I want to salvage for my project, the only issue is it is using two 2500mah batteries in parallel and I don't have the space for both of them in the case. Does anyone know if I could desolder one of these batteries and have the charging circuit run as normal? I'm not sure if disconnecting one of them would make a difference at all or if it is something I shouldn't attempt. Does anyone have some good knowledge on how these charging circuits work and if I will have any issues if I do this? Here is what I am looking at