The problem I have had when using these Batts is they just dont give me the constant Voltage nor the run times I'm looking for. I ended up not using them any longer and just found using a VV
mod was much better. they couldn't hold the 4.8V consistently throughout my entire Battery charge until I have to swap Batts as well, they come off the charger around 5.4 or so and work there way down to the 4.8v. Now if they made a 4.8IMR that would be super but that chemistry just isn't available, even if they could produce them in a 2600-2900mAh they would have been great, but not available, Conclusion was that VV was the way to go since you can hold your same voltage throughout your
vape session, just my opinion, but I did like those 4.8 Batts