Why Battery Choice Matters for ARRMA
ARRMA bashers put serious torque on the drivetrain. A 6S 3300kV motor on a Kraton 6S can draw 60-80 A under full throttle. Cheap LiPo cells or a weak C-rating collapse under that load, causing voltage sag, heat, and shutdown mid-run. A properly matched battery keeps punch consistent lap-to-lap and extends motor life.
Real-world example: Swapping a 5000mAh 30C NiMH on a Senton 3S with a 6500mAh 50C LiPo dropped lap times by 1.8 s on a 60-s track lap. Voltage sag under load dropped from 0.8 V to 0.3 V, and motor temps fell from 185 °F to 145 °F.
LiPo vs NiMH for ARRMA Bashers
- NiMH (7.2 V 5000mAh 9-cell): Cheap plug-and-play, but 25-35 C continuous means you lose punch after 3-4 minutes of hard bashing. Weight is ~28 oz vs 14 oz for a 6S 5000mAh LiPo.
- LiPo (2S/3S/6S): 50-100 C burst allows 8-12 minutes of aggressive runs. 50 % lighter = better handling on jumps. Requires balance charging and proper storage.
Bottom line: NiMH is fine for casual backyard crawling. LiPo is mandatory for track bashing and big jumps.
Recommended Voltage: 2S vs 3S vs 6S
ARRMA models ship with different stock voltages. Choose based on your setup:
| Voltage | ARRMA Models | Motor Kv Range | Run Time | Best For |
|---|---|---|---|---|
| 2S (7.4 V) | ARRMA Infraction, Raptor | 1900-2650 Kv | 12-15 min | Low-speed crawlers, rock crawlers |
| 3S (11.1 V) | ARRMA Senton 3S, Granite, MST | 2300-3300 Kv | 10-13 min | General bashing, jumps under 10 ft |
| 6S (22.2 V) | ARRMA Kraton 6S, Infraction 6S | 1700-2200 Kv | 8-10 min | High-speed bashing, big jumps, track |
If you're upgrading, match the voltage to your ESC. A 3S ESC cannot safely handle 6S without firmware reflash or a firmware update.
Capacity: 5000mAh vs 6500mAh vs 8000mAh
Capacity determines run time, but weight and ESC limits matter more. Use this chart for ARRMA:
| Capacity | Weight (oz) | Run Time (3S 50C) | ESC Limit | Best Fit |
|---|---|---|---|---|
| 5000 mAh | 12-14 | 10-12 min | 60-80 A | Senton 3S, Granite, track bashers |
| 6500 mAh | 16-18 | 13-15 min | 80-100 A | Kraton 6S, big bashers |
| 8000 mAh | 20-22 | 16-18 min | 100-120 A | Truggy, extra-long sessions |
Example: A 6500mAh 6S 75C LiPo on a Kraton 6S adds ~1.3 lb nose-heavy, so balance with a heavier front shock oil or battery tray spacer.
C-Rating: What You Actually Need
C-rating tells you the continuous discharge. For ARRMA:
- 30-40 C: OK for casual 3S Senton bashing, but expect sag after 5 minutes.
- 50-75 C: Ideal for 3S Senton and 6S Kraton under 25 mph.
- 100 C+ burst: Needed for 6S Kraton hitting 40+ mph or mega jumps.
Check ESC specs. A Hobbywing 100 A 6S ESC can handle 5000mAh 100C LiPo, but a 60 A 3S ESC needs a 5000mAh 40C max.
Best Batteries for ARRMA Kraton 6S
1. Gens Ace 6S 75C 6500mAh 25C 120C (LiHV)
Pros: LiHV delivers 4.35 V/cell under load (better than standard 4.2 V), 6500 mAh for 13-15 min runs, 75C continuous / 120C burst. Comes with XT90 plug pre-installed.
Cons: Slightly heavier than 5000 mAh options. Requires LiHV-compatible charger.
Use case: If you track bash and want extra punch without upgrading ESC.
2. Traxxas 4078X 6S 7000mAh 65C
Pros: Plug-and-play XT90, 7000 mAh for 15+ min, 65C continuous. Trusted brand, good warranty.
Cons: Voltage sag noticeable at 50+ A continuous. Not LiHV.
Use case: Ideal for backyard bashing where run time beats ultimate punch.
3. ZD LiPo 6S 8000mAh 100C
Pros: 8000 mAh for 18+ min, 100C burst, XT90 plug, LiHV option available. Great value per mAh.
Cons: Heavy (22 oz). Needs 100 A+ ESC.
Use case: Long sessions on big outdoor tracks.
Best Batteries for ARRMA Senton 3S
1. Gens Ace 3S 75C 5000mAh 25C 120C (LiHV)
Pros: LiHV keeps voltage up, 5000 mAh for 12 min, XT60 plug, balance charge lead included.
Cons: LiHV charger required. Slightly pricier.
Use case: If you want consistent punch on jumps and don't want to land nose-first due to sag.
2. Venom 3S 7000mAh 50C
Pros: Cheaper, 50C continuous is plenty for Senton 3S, comes with Venom plug (XT60 adapter included).
Cons: Standard 4.2 V cut-off, 7000 mAh adds weight.
Use case: Budget-friendly option for weekend bashers.
Safe Charging Practices for LiPo
LiPo fires start at the charger. Follow these rules:
- Use a LiPo-specific balance charger: iCharger 106B+, SkyRC iMax B6AC, or Turnigy Reaktor. Avoid car chargers.
- Set charge rate to 1C: For a 5000 mAh battery, charge at 5 A. A 6500 mAh at 6.5 A. Charging at 2C shortens cell life.
- Balance charge every time: Ensures all cells reach 3.6-4.2 V. Never skip balance leads.
- Charge on a LiPo-safe mat: A silicone charging mat or dedicated fireproof bag reduces risk.
- Monitor temperature: Stop if cells exceed 110 °F (43 °C) during charge. Swelling = replace immediately.
Pro tip: Charge in a garage with a CO sensor, not indoors. Keep a fire extinguisher rated for metal fires (Type D).
Storage & Transport Tips
LiPo cells self-discharge 5-10 % per month. Storage at 3.8-3.85 V per cell prevents imbalance.
- Storage charge: Use a storage program on your charger or manually set 3.8 V per cell.
- Keep cool: Store in a shaded garage or temperature-controlled room. Avoid direct sunlight or car dash.
- Transport: Use a LiPo-safe bag or ammo can with foam padding. Never leave in a hot car trunk.
- Check before every session: Inspect for puffiness, leaks, or heat. A puffed cell must be recycled, not flown.
FAQ
No. The Kraton 6S motor and ESC are designed for 22.2 V (6S). A 3S battery will not provide enough voltage for the motor to spin properly, resulting in sluggish acceleration and potential ESC errors. Some users have reflashed the Hobbywing ESC to accept 3S, but this voids warranty and may cause instability.
Signs of a puffed LiPo: bulging sides, soft or spongy case, or a swollen appearance. A puffed cell may also feel warm to the touch. Never fly or charge a puffed battery-it poses a fire risk. Dispose of it at an electronics recycling center.
Exceeding the C-rating causes voltage sag and heat build-up. Continuous over-discharge leads to cell damage, reduced capacity, and shorter lifespan. In extreme cases, it can trigger an internal short, causing a fire. Always match battery C-rating to ESC and motor load.
No. A 3S charger cannot provide the voltage needed for a 6S battery. Attempting to charge a 6S LiPo with a 3S charger will result in a dangerous under-voltage condition. Use a charger rated for the correct cell count (e.g., 6S max for a 6S battery).
Typical causes: charging at too high a C-rate (e.g., 3C), exceeding 110 °F during charge, or storing at 100 % charge for weeks. Use 1C charge rate, monitor temps, and store at 3.8 V per cell to extend cycle life.