FWIW - even though the specs were the same: threads, voltage, etc, and even the outside looked the same on three different brand 2 piece
batteries (S51, LoongTotem and e-cig) I couldn't get the different manufacturers
batteries to charge in different chargers.
What's strange is that a cheaper clone USB charger wall adapter that I got as a sample from a third-party battery "manufacturer" in China works with all of the USB adapters (S51, LoongTotem and e-cig). They did not have any RoHS or CE on it like the others but had UL, which only one of the others had.
After having a disposable cigar go on fire in someone's pocket - I'm a bit gunshy here.