Button Top Vs Flat Top Battery. Converting a flat top into a button top cell by soldering. As you can probably make out the top one is 37 volts and the bottom battery is 36 volts.
The top is flat. Your emisar d4 has spring contacts at both ends and will accept flat top cells. Here is the battery connection in 3 flashlight heads.
On average most button top batteries are 1mm longer than the flat top counterpart with the smpl mod this may cause the button to protrude past the outer bottom edge of the mod depending on how close it already is.
They both use flat top batteries. On average most button top batteries are 1mm longer than the flat top counterpart with the smpl mod this may cause the button to protrude past the outer bottom edge of the mod depending on how close it already is. Atk 37v 18650 battery. In practice a good button top performs as well as a flat top.