The Helios RC 2S 600 45C pack is perfect for small-scale trucks. Packs come with JST-PH2.0 plugs already installed, making it a great option for the Axial SCX24 and other micro-size rigs that use a PH2.0 connection.
Battery pack performance typically improves after initial use. Helios recommends going through 5 charge/discharge cycles before the battery is considered "broken in".