RC TORQUEHOUSE / POWER, MADE VISIBLE
Battery lab
Build a standard LiPo pack from 2S to 6S, then trace its nominal voltage and energy through an RC power path. The values are deliberate idealizations—not an upgrade recommendation or a speed, heat, current or runtime prediction.
01 / PACK BUILDER
Series cells add voltage
Standard LiPo model only: each series cell is treated as 3.7 V nominal and 4.2 V at full-charge maximum. Series count changes voltage; it does not change the mAh value shown for the series string. Nominal watt-hours are a label-level energy estimate. A Horizon example computes a 6S 3200 mAh pack as 71.04 Wh from 22.2 V × 3.2 Ah. Source.
02 / POWER FLOW
Battery → ESC → motor → gears → tyres
Static power path. Play is optional and illustrative.
Moving from 2S to 4S doubles this model’s nominal voltage, and Kv × voltage doubles the ideal unloaded RPM. It does not automatically double usable power, speed, current or runtime. Load, ESC control, motor efficiency, gearing, tyres, battery voltage sag and heat change the outcome. The optional watts card holds current fixed only to demonstrate P = V × I; the same current is not guaranteed in a real vehicle.
03 / SAFETY BOUNDARY
The calculation stops at the workbench
Charge the labelled cell count. The Spektrum/E-flite guide says to set the charger to the pack label’s cell count/voltage and warns that a different selection can cause fire.
4.2 V is a maximum, not a target to exceed. That guide says LiPo cells should never be charged above 4.2 V per cell.
Do not generalize C-ratings. This lab intentionally does not turn a C number into a performance claim; pack condition, wiring, connectors, load and manufacturer limits all matter.
Read the manufacturer guide for its full charging, inspection, damaged-pack and disposal guidance. Stop and use the exact manual if pack, charger, connector or voltage compatibility is unclear.