I'm starting to get back into model flying after years away from the hobby. When I was last regularly involved Lipo's didn't exist in the hobby.
As something to do with the kids, I've got a couple of the small cheap shop models for them to use/crash prior to getting my older/better stuff updated.
Both of these have single cell lipo's. Both charge the battery via a plug on the model, both batteries have a small PCB as part of the battery.
My question is, are these PCB's part of the charging/control system of the model or a normal part of the Lipo battery? Having not used them before I have nothing to compare them with.