The Tamiya Stick 1000mAh 7.4V 25C Li-Po battery is a top-quality LiPo pack made by American company Titan Power. Known as the successor to lithium-ion packs, LiPo packs have a high capacity-to-size ratio, making them perfect for any AEG replica. These packs have no memory effect and can be frequently charged without being fully discharged. While in storage, they only lose about 3-5% of their energy per month. It's important to monitor these packs and not let them discharge below 3V per cell, as irreversible chemical reactions may occur. To maintain their lifespan of 500-700 cycles, it's recommended to charge LiPo packs at about 70% capacity. These packs perform well in low temperatures but should be charged at room temperature. To ensure optimal condition, LiPo packs should be balanced during charging using the service plug that most packs come with.