Recharging Li-Ion Battery Pack

Hey everyone.

So I am working on my boxy 445nm, and I need to figure out a way to not have to remove the batteries (two 18650s) in order to recharge, because just changing batteries is kind of obnoxious.

Is there a way that I could just take my home-made battery pack and just plug it into a single 18650 charger and get twice the charge time? The idea is that the charger is a smart charger, so it wouldn't damage them, but it is only built for a single 18650. It lets of 4.2V at 650mA, which is great for charging one... but is it safe to charge two 18650s in series?

I know I could charge them in parallel easily, but then the question is, how do I charge in parallel and then switch it to a series to run off of?

Questions, questions, questions... anyway, help please!

(The reason for this is so I can just completely close off my battery pack because the front end keeps on falling off.)

No, they would need to be charged in parallel. I'm sure it can be done with some fancy toggle switch work.

Hmm, alright. I will begin work on it.