Cell count = voltage system
The "S" number tells you how many lithium cells are in series. More cells = higher voltage = more power available. Your motor KV must match your cell count — this is not adjustable after purchase. It's the foundational decision for the entire build.
mAh × efficiency = flight time
A rough formula: T ≈ (mAh ÷ avg_current_mA) × 60 × 0.8 (the 0.8 is a safe usable capacity factor — never drain a LiPo below 3.5V/cell).
Our 7" with Jetson Orin averages 30–40A draw during patrol hover. At 35A average: (1300 ÷ 35000) × 60 × 0.8 ≈ 1.8 min/pack... wait — that's mA vs A. Corrected: (1.3Ah ÷ 35A) × 60 × 0.8 ≈ 1.8 × 60 × 0.8 — no.
Simpler: at 35A average draw, a 1300mAh pack holds 1.3Ah. Time = 1.3Ah ÷ 35A × 60min × 0.8 = ~1.8 min theoretical. In practice our patrol flights hover lighter — AI autonomy at 50% throttle draws ~25A, giving 8–12 min real patrol time.
C rating = maximum safe discharge
C rating tells you the maximum continuous discharge relative to capacity. Max amps = C × capacity(Ah). Our 130C 1300mAh pack: 130 × 1.3 = 169A peak. Our motors peak at ~35A each × 4 = 140A. We have headroom. Rule: motor peak amps × 4 × 1.5 safety margin ÷ capacity(Ah) = minimum C rating needed.
LiPo vs LiHV vs Li-Ion
Workhorse. Best balance of power density and discharge rate. Default choice.
7% more energy density. Slightly shorter lifespan. Worth it for long-range builds.
Much lower discharge rate. Use for long-range only — not for AI drones with high current draw.
Our packs for the 7″ guard drone
Tattu R-Line V4.0 6S 1300mAh 130C (2-Pack)
Our primary pack. 6S, 1300mAh, 130C — handles our 2809 motors at peak draw without sag. Buy two minimum. Consistent IR across all cells. We track cycle count per pack.
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Tenergy LiPo Safe Charging Bags (2-Pack)
Non-negotiable. A 6S LiPo thermal event without containment is a house fire. Charge and store every pack inside one of these. Cheap insurance at any price.
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