Battery Insulation Sticker. Features: Keeps the battery warm during cold weather use. Low temperatures will affect LiPo battery performance. Therefore maintaining a suitable temperature above 20˚C ensures proper battery performance. When flying in cold environments, please attach this sticker on the surface of the battery to keep the battery within temperature range. 2 pcs in box. Compatibility: Inspire 2 - TB50 Intelligent Flight Battery (4280mAh).