Spektrum Batteries 11.1 V (3S)

Spektrum 11.1 V (3S) Smart LiPo Batteries

Get a noticeable bump in acceleration and top speed with manageable weight. Spektrum 3S Smart packs pair clean power delivery with integrated electronics that streamline charging, monitor health, and keep wiring simple with IC3/IC5 connectors.

What Changes When You Move to 3S

• Higher voltage: 11.1 V nominal (12.6 V full) vs. 7.4 V nominal for 2S. Expect up to ~50% higher motor RPM on the same Kv.
• Stronger launches and pulls: Improved throttle response out of corners, on climbs, and during punchy maneuvers.
• Stable pace: Consistent voltage helps avoid early low-voltage cutoffs in long pulls.
• Smart convenience: Auto charger setup, cycle and health logging, and cleaner wiring with IC connectors.

Where 3S Packs Shine

RC Cars and Trucks (1/10)

Stadium trucks, SCTs, and touring cars gain pace for open layouts. Start with slightly lower gearing than 2S, then tune back up while watching temps.

Lightweight and Sport Boats

Keeps small hulls on plane with responsive throttle in chop. Use secure battery trays and strain relief for leads to handle vibration and spray.

Park Flyers and FPV Quads

Natural step up from 2S: quicker climbs, crisper aerobatics, and confident recoveries without excessive weight. Common on 3–5 inch quads and small foamies.

How to Choose a Spektrum 3S Pack

Use case	Capacity (mAh)	C rating	Case	Connector
1/10 SCT & stadium truck	4000–6000	50C+	Hard case	IC5 for high current, IC3 if moderate
Touring/drift (1/10)	3000–5000	30–50C	Hard case	IC3
Small sport boat	2200–5000	50C+	Soft or hard (fit dictates)	IC5 if high draw
Park flyer	1500–3000	30–50C	Soft case	IC3
FPV quad (3–5")	1300–2200	60C+	Soft case	IC3

• Fit first: Check tray size, strap clearance, and CG. Hard-case packs are larger; soft-case saves space and weight.
• Discharge rating: High-draw setups (big props, high Kv) benefit from higher C ratings to reduce voltage sag and heat.
• Connector choice: IC3 suits most 3S uses; choose IC5 for sustained high current to minimize resistance and connector heat.

Setup and Tuning on 3S

• Gearing: Moving from 2S to 3S, drop 1–3 pinion teeth (or reduce rollout 10–20%) to control temps. Re-test and adjust.
• ESC settings: Add punch control and soften throttle curves on low grip. Set LVC to ~3.2–3.4 V per cell under load.
• Thermals: Aim to keep the battery under ~140°F (60°C), ESC under ~160°F (71°C), and motor under ~180°F (82°C).
• Cooling: Add fans or ducts for long, high-load runs (grass, sand, boats with constant throttle).

Charging and Care

• Charge rate: Default to 1C unless the label states a higher approved rate. Example: 5000 mAh at 1C ≈ 5 A.
• Smart charging: Smart/Smart G2 packs auto-set charge parameters with compatible Spektrum Smart chargers. G2 packs balance through the main lead.
• Storage: Store at 3.75–3.85 V per cell. Many Smart chargers offer auto storage modes.
• Safety: Charge on a non-flammable surface in a LiPo-safe bag, in sight. Do not use or charge if the pack is swollen or damaged.
• Cool before recharging: Let packs return to ambient temperature to protect cycle life.

Runtime: Quick Estimates

Approximate runtime (minutes) = (Capacity in mAh ÷ Average current in A) × 60.

• 1/10 SCT, 5000 mAh, ~20 A average → ~15 minutes.
• FPV quad, 1500 mAh, ~25 A average → ~3–4 minutes.
• Park flyer, 2200 mAh, ~12 A average → ~11 minutes.

Compatibility Notes and Alternatives

• ESC/motor limits: Confirm both are rated for 3S. Many brushed 540 motors are not; they overheat on 11.1 V.
• Connectors: Spektrum IC3/IC5 mate with EC3/EC5 for power, but Smart data is not passed through EC adapters.
• When to stay 2S: Tight tracks or fragile drivetrains where traction and temps are the priority.
• When to go 4S: Heavy rigs, speed runs, or boats needing sustained high wattage—provided the system is rated for it.

FAQ

Is my RTR ready for 3S?

Check the ESC and motor specs. If both list 3S (11.1 V) capability, you can run 3S. If unsure, consult the manual or manufacturer support.

Do I need IC5 on 3S?

Use IC3 for moderate current (most 1/10 cars, park flyers). Choose IC5 for high-current loads (hard launches, boats, heavy gearing) to reduce connector heat.

Can I charge a Smart pack with a non-Smart charger?

Yes, as a standard LiPo at the labeled settings, but you lose Smart auto-setup and data features. G2 packs require a G2-capable Smart charger for full functionality.

Will 3S shorten drivetrain life?

Higher voltage can stress gears and diffs if gearing and punch are aggressive. Start geared down, add throttle shaping, and maintain bearings and diffs.

What voltage should I stop at?

Set LVC around 3.2–3.4 V per cell under load and stop runs when performance drops. Do not routinely discharge below ~3.5 V per cell at rest.