Always the correct part
ProTek RC 1S LiPo Transmitter Battery Pack (3.7V/3000mAh) (Sanwa MT-44)
This ProTek R/C 1S 3000mAh LiPo transmitter pack was developed specifically for the Airtronics/Sanwa MT-44 transmitter. This light weight LiPo battery will help to reduce the overall weight of your transmitter, which is great for long main events! The overall weight will be significantly reduced when compared to a typical NiMH transmitter pack and will provide an incredible amount of run time!
Chemistry: Lithium Polymer
Charge Rate: 2C
Dimension (LxWxH): 62.5x45x8.5mm
This is a Amain brand and all warranty work or issues will have to be dealt with directly with Amain Hobbies.