is it safe to use batteries previously used?

[Cacique]

hey everyone. I was able to pick up my sigelei 150 instead of having to wait until tomorrow. would it be safe to you 2 Samsung 25r that I have been using in my mech mod? I have new batteries coming in but they don't arrive until late tomorrow. I have these 2 charging together.

 

[socalsailor]

As long as they have similar cycle lifetimes, it doesn't sound like an unsafe situation. Make sure they're both fully charged before inserting them in the Sigelei, and I'll bet they won't cause you problems.