The battery voltage at 12S should be:

12S battery pack with nominal voltage of 3.7V*12S=44.4V.

A 12S battery pack, peak voltage 4.2V*12S=50.4V.

The 18650 lithium-ion battery is usually a custom or prefabricated battery pack.Our electric slide pack consists of a number of personal 18650 lithium-ion batteries.

Lithium polymer or Lipo battery packs are typical RC Lipo battery packs and can usually be purchased from RC type websites.