Novak has released a 4-Cell Transponder Voltage Booster which should prevent laps not being counted when the battery gets to a low level.

Description from Novak:

Novak's 4-Cell Transponder Voltage Booster is the ideal counterpart for all 4-cell applications, including the #1714 GTB 4-Cell Brushless ESC. The module connects between the vehicle's transponder and the receiver, and boosts voltage to the transponder for consistent lap counting — even when the battery pack is dumped.

Novak Electronics 4-Cell Transponder Voltage Booster

Source: Novak Shop