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Torquehouse /RESEARCH CHAPTER 04

Batteries, charging & rules

Supplied source dossier · Prepared September 17, 2026 · Claims retain their original qualification.

From the September 2026 research edition. Product details and prices are dated source records; confirm the exact model and manual before buying or making changes.

Research date: 2026-09-17. All "accessed" dates are 2026-09-17 unless a publication date is given. Prices are list/retailer prices seen on the access date and change often. Items not confirmed from a fetched source in this session are marked unverified.

1. Chemistry basics: LiPo vs LiHV vs NiMH

Cell voltages

Storage voltage (differs by maker)

Minimum and cutoff voltages

Charging and temperature limits (manufacturer sheets)

2. C rating vs internal resistance (IR)

3. Connectors and current ratings

Connector Rating found Who states it Source
XT60 (genuine Amass) 30 A continuous / 60 A burst (12 AWG) Holybro, citing genuine Amass specs; continuous = 4 h at <60 °C rise, burst = 1 min https://docs.holybro.com/power-module-and-pdb/power-module/connector-and-wire-rating (accessed 2026-09-17)
XT90 (genuine Amass) 45 A continuous / 90 A burst (10 AWG) Holybro, citing Amass same
XT120 / AS150 60 A / 120 A; 75 A / 150 A Holybro, citing Amass same
XT30/60/90/150 "approximate" 30/60/90/150 A (naming convention) Connector Supplier trade article https://connectorsupplier.com/meet-the-connector-xt-connectors/ (2024-11-05)
Deans Ultra (T-plug) 60–75 A (retailer). W.S. Deans' own 2025 blog post discusses a 200 A burst test but gives no official rating EuroRC (retailer); Deans https://www.eurorc.com/page/157/rc-connectors-explained ; https://www.wsdeans.com/blogs/news/can-the-deans%C2%AE-ultra-plug%C2%AE-take-a-burst-of-200-amps (2025-09-07)
EC5 "up to 120 A" (retailer). Horizon's EC5 product page gives no amp rating and calls it "ideal for high power applications" ($5.99 per set) EuroRC; Horizon eurorc URL above; https://www.horizonhobby.com/product/e-flite-connector-ec5-device-and-ec5-battery-set/EFLAEC503.html
IC5 120 A (retailer chart) EuroRC; not found on a Spektrum page eurorc URL above
IC3 No rating found from any source — https://www.spektrumrc.com/product/adapter-ic5-battery-ic3-device/SPMXCA508.html (no rating)
Traxxas iD / High-Current 75 A continuous (retailer). Traxxas product pages checked give no rating EuroRC eurorc URL above; https://traxxas.com/2997-dual-4s-lipo-completer-w-ez-peak-live-dual-charger

4. Smart batteries: Traxxas iD and Spektrum Smart

Traxxas iD

Spektrum Smart (Horizon Hobby)

ISDT

  • 608AC: 200 W charger with a removable 60 W AC PSU (so AC input is limited to 60 W); 10–30 V DC input; 0.1–8 A; 1–6S. About $60 (review first published 2020-02-02, updated 2023-02-15). [source: https://oscarliang.com/isdt-608ac-lipo-charger/, accessed 2026-09-17]
  • Q6 Nano (BattGo): DC 10–30 V; 200 W; 0.1–8 A; 10 W discharge; 1–6S lithium, 1–16 NiMH; 120 g. Out of stock at GetFPV with no price shown. [source: https://www.getfpv.com/isdt-q6-nano-battgo-200w-8a-1-6s-smart-charger.html, accessed 2026-09-17]
  • Q6 Retro: the ISDT Shop page at the old Q6 Nano URL now shows the Q6 Retro: 350 W, 16 A, 1–6S, 2.4" IPS, ISDLink app, BattAir support; $35 sale ($39.99 list); "Sold out." This may be the successor to the Q6 Nano. Unverified. [source: https://isdtshop.com/products/isdt-q6-nano, accessed 2026-09-17]
  • K4: dual channel; AC 400 W / DC 600 W × 2; 30 A × 2; LiPo/LiFe/LiIon 1–8S, LiHV 1–7S; touchscreen; $249 at ISDT Shop, "Sold out." [source: https://isdtshop.com/products/isdt-k4, accessed 2026-09-17]
  • K4 successor: ISDT's product index lists the K4 and K2 Air under AC+DC chargers. No announced K4 successor was found. Unverified / none confirmed. [source: https://www.isdt.co/compare?lang=en, accessed 2026-09-17]

ToolkitRC

  • M6AC: AC 100–240 V (max 120 W) or DC 7–35 V (max 30 A); 300 W on DC; 0.1–15 A; 1 A balance current; lithium 1–6S. Price not listed. [source: https://www.toolkitrc.com/product/m6ac/, accessed 2026-09-17]
  • M8AC: AC 200 W / DC 600 W; up to 20 A; lithium 1–8S; 65 W USB-C; 1 A balance current; also works as a servo and signal tester; 500 g. Price not listed. [source: https://www.toolkitrc.com/product/m8ac/, accessed 2026-09-17]
  • Q6AC: 4 channels; internal AC 400 W / DC 1000 W (XT90 input); 15 A per channel; 1–6S; 3.5" touchscreen; 65 W USB; 1,150 g. Price not listed. [source: https://www.toolkitrc.com/q6ac/, accessed 2026-09-17]

SkyRC

  • B6neo series: DC (XT60) plus USB-C PD input. B6neo: DC 10–28 V, 200 W, 0.2–10 A. B6neo+: PD 3.1, up to 126 W on USB-C. B6neo 2: up to 300 W, 15 A. All 1–6S; 70×50×31 mm. [source: https://www.skyrc.com/b6neo, accessed 2026-09-17] Price: Amazon could not be fetched. Unverified.
  • D100neo: two ports; AC 100 W total, DC 200 W total (100 W per port); 0.2–10 A; 1–6S lithium. [source: https://www.skyrc.com/d100neo, accessed 2026-09-17] Price unverified.

Hitec

6. Safe charging and fire response (authorities)

  • FDNY tips for lithium-ion devices: look for a UL mark; use the manufacturer's charger and batteries; charge outside if possible; plug directly into a wall outlet (no extension cords); do not charge in a bedroom or near exits; charge on the floor; keep batteries at room temperature, out of direct sunlight and away from flammables; watch for "odors, changes in shape or color, leaking, or odd noises." [source: https://www.fdnysmart.org/be-fdnysmart-when-using-any-devices-powered-by-lithium-ion-batteries/, accessed 2026-09-17]
  • FDNY, if a battery is failing: "discontinue use immediately. If it is safe to do so, move the device away from anything that can catch fire and call 9-1-1." [source: same]
  • FDNY disposal (NYC): putting lithium-ion batteries in household trash or recycling is illegal in NYC. Take them to a Special Waste Drop-Off Site, and bag each battery or tape its terminals. [source: same]
  • London Fire Brigade: lithium battery fires "produce intense fires that spread rapidly" with "toxic smoke." LFB says many e-bike and e-scooter battery fires happen during charging and advises registering products for recall alerts. The LFB page is focused on e-bikes; no RC-specific guidance was found. [source: https://www.london-fire.gov.uk/safety/lithium-batteries/, accessed 2026-09-17]
  • Traxxas: charge LiPo in a fire-retardant or fireproof container and use only a LiPo balance charger. [source: https://traxxas.com/articles/traxxas_lipo_batteries, accessed 2026-09-17]
  • Horizon/Spektrum: store in a "non-conductive and fireproof container"; "In the event of fire, immediately call emergency services as only a Class D, dry chemical fire extinguisher must be used." See the Conflicts section below. [source: https://www.spektrumrc.com/on/demandware.static/-/Sites-horizon-master/default/dw75ace54e/Manuals/54892_Lithium_Battery_Safety.pdf, accessed 2026-09-17]
  • Horizon/Spektrum: stop using and dispose of damaged or swollen batteries immediately, following local laws. [source: same PDF]
  • PHMSA: damaged, defective or recalled batteries "have greater potential ... to short circuit, to release heat, or even to cause a fire"; do not put lithium batteries in the trash or general recycling. [source: https://www.phmsa.dot.gov/lithiumbatteries, accessed 2026-09-17]
  • NFPA, CPSC, UL Solutions/FSRI ("Take C.H.A.R.G.E."): pages were blocked or rate-limited during this session and could not be quoted. Gap.
  • LiPo bags and containers: no independent or authoritative test was retrieved (the search budget ran out). Gap / unverified. Makers recommend fireproof containers (see above), but no lab validation of consumer LiPo bags was confirmed here.

7. Air travel (US): FAA PackSafe and TSA

  • Spare (uninstalled) lithium-ion batteries go in carry-on only. If a carry-on is gate-checked, "all spare lithium batteries and power banks must be removed from the bag and kept with the passenger in the aircraft cabin." [source: https://www.faa.gov/hazmat/packsafe/lithium-batteries, accessed 2026-09-17]
  • Up to 100 Wh per battery is allowed without approval. "With airline approval, passengers may also carry up to two spare larger lithium ion batteries" of 101–160 Wh. Over 160 Wh is forbidden for passengers. [source: https://www.faa.gov/hazmat/packsafe/lithium-batteries; https://www.faa.gov/hazmat/packsafe/resources/airline-passengers-batteries, accessed 2026-09-17]
  • Terminal protection: keep packs in retail packaging, tape over terminals, or use a battery case or similar. [source: https://www.faa.gov/hazmat/packsafe/lithium-batteries, accessed 2026-09-17]
  • TSA, batteries over 100 Wh: carry-on "Yes (Special Instructions)," checked "No"; up to two 101–160 Wh spares with airline approval. [source: https://www.tsa.gov/travel/security-screening/whatcanibring/items/lithium-batteries-more-100-watt-hours, accessed 2026-09-17]
  • The FAA puts no specific count limit on spares of 100 Wh or less on the pages fetched; airlines may set their own limits. Airline-specific limits were not verified.
  • Wh formula (FAA): "multiply the volts (V) by the amp hours (Ah)." FAA example: 12 V × 8 Ah = 96 Wh. [source: https://www.faa.gov/hazmat/packsafe/resources/airline-passengers-batteries, accessed 2026-09-17]
  • RC examples (calculated with the FAA formula at nominal voltage):
    • 2S 5000 mAh LiPo: 7.4 V × 5.0 Ah = 37 Wh. Allowed as a spare in carry-on.
    • 3S 5000 mAh: 11.1 V × 5.0 Ah = 55.5 Wh (Spektrum labels SPMX53S30 at 55.5 Wh). Allowed.
    • 4S 5000 mAh: 14.8 V × 5.0 Ah = 74 Wh. Allowed.
    • 4S 6700 mAh (Traxxas 2890X): 14.8 × 6.7 = 99.2 Wh. Just under 100 Wh.
    • 6S 5000 mAh: 22.2 V × 5.0 Ah = 111 Wh. Needs airline approval; maximum two.
    • 2S 5000 LiHV: 7.6 V × 5.0 Ah = 38 Wh (LiHV nominal 3.8 V/cell).
    • 6S 8000 mAh: 22.2 × 8 = 177.6 Wh. Forbidden for passengers.
  • International (IATA) and non-US airline rules were not researched here. Gap.

8. Shipping lithium batteries (US)

  • PHMSA/DOT: lithium batteries are hazardous materials under the HMR (49 CFR Parts 171–180); detailed requirements are in 49 CFR 173.185. Cells and batteries must pass UN 38.3 design tests. Since 2022-01-21, manufacturers must provide test summaries on request. The HMR covers air, highway, rail and water. [source: https://www.phmsa.dot.gov/lithiumbatteries, accessed 2026-09-17]
  • USPS (Publication 52, Packaging Instruction 9D, domestic): standalone lithium-ion or lithium-polymer batteries (not in or with equipment) are mailable "in limited quantities via surface transportation only" (air is prohibited, with an Alaska exception). Limits: 20 Wh per cell and 100 Wh per battery; mailpiece no more than 5 lb; must be in the original sealed packaging; needs the DOT lithium battery mark with UN3480 plus "Surface Mail Only..." wording. Damaged, defective or recalled batteries are prohibited unless approved. [source: https://pe.usps.com/text/pub52/pub52apxc_032.htm, accessed 2026-09-17]
  • USPS consumer page: pre-owned, damaged or defective devices containing lithium batteries must travel by ground and be marked "Restricted Electronic Device" and "Surface Transportation Only." [source: https://www.usps.com/ship/shipping-restrictions.htm, accessed 2026-09-17]
  • Practical implication: under USPS 9D, a 6S 5000 mAh pack (111 Wh) is over the 100 Wh per-battery limit for mailing.
  • UPS and FedEx: their lithium battery pages returned 404 errors at the URLs tried. Carrier-specific rules (such as contract or hazmat agreement requirements, and whether retail counters accept them) are unverified in this session. Gap.

9. Recycling and puffed-battery disposal

10. Recalls (CPSC; Health Canada)

Searched CPSC recall data (SaferProducts.gov API) for "charger", "battery" and "remote control" recalls since 2019-01-01. Only two RC-hobby-relevant results came up:

11. EU Battery Regulation (EU) 2023/1542 (brief)

The EU Commission and EUR-Lex pages were rate-limited or blocked in this session. The dates below come from prior knowledge and are unverified this session; confirm them on EUR-Lex (https://eur-lex.europa.eu/eli/reg/2023/1542/oj).

  • Entered into force 17 Aug 2023; generally applies from 18 Feb 2024 (replacing Directive 2006/66/EC in stages). Unverified.
  • Portable batteries in appliances must be removable and replaceable by the end user from 18 Feb 2027 (Art. 11, with exceptions). Unverified.
  • Labelling requirements from 18 Aug 2026 and QR code from 18 Feb 2027. Unverified.
  • Collection targets for portable batteries: 45% (2023), 63% by end of 2027, 73% by end of 2030. Unverified.
  • Battery passport from 18 Feb 2027 applies to LMT, EV and industrial batteries over 2 kWh, not ordinary portable RC packs. Unverified. Due-diligence obligations were postponed (to 2027) by a 2025 amendment. Unverified.

Conflicts / uncertain

  1. Storage voltage varies by source: Horizon/TRI says 3.8 V/cell; Spektrum Smart G2 auto-stores to 3.90 V/cell; Gens Ace gives a 3.6–3.9 V range; Grepow says 3.80–3.85 V for LiHV; Traxxas says only "about 50%." There is no single industry figure.
  2. Minimum voltage: Gens Ace and Horizon say never below 3.0 V/cell; Traxxas LVD triggers at 3.2 V/cell; Tattu and Grepow suggest 3.5 V/cell for longevity.
  3. Fire response: the Horizon/Spektrum sheet says only a "Class D, dry chemical" extinguisher must be used. FDNY advises moving the item away from combustibles only if safe and calling 911. The "Class D" wording is unusual (Class D is normally a combustible-metals classification) and no fire authority retrieved here endorsed it. Follow fire-service guidance: get out and call emergency services.
  4. Connector ratings: most circulating numbers (Deans 60–75 A, EC5 and IC5 120 A, Traxxas iD 75 A) come from retailers, not makers. Genuine Amass XT60 is 30 A continuous per the Holybro/Amass table, well below the "60 A" implied by the name.
  5. C ratings: labeled C ratings are widely considered inflated. The best available independent evidence (RCexplained, 2026; rchelicopterfun) comes from enthusiasts, not accredited labs.
  6. ISDT lineup: the Q6 Nano appears discontinued or replaced by the Q6 Retro, and the K4 was sold out. A successor to the K4 was not confirmed.
  7. Prices come from manufacturer or retailer pages on 2026-09-17 and from older reviews (608AC about $60 in a 2020–2023 review; RDX2 Pro about $174 in 2021). Treat as indicative.
  8. Spektrum G2 charger compatibility: the FAQ says G2 packs need a Smart charger with G2 firmware; the product page says G2 packs are "not compatible with non-Smart chargers." These agree, but aftermarket IC-to-balance adapters, if any, were not assessed.

Gaps (not verified this session)

  • NFPA, CPSC and UL Solutions/FSRI consumer guidance text (pages blocked or rate-limited).
  • Independent tests of LiPo bags, ammo cans and fire containers.
  • UPS and FedEx lithium battery rules for individuals.
  • Call2Recycle damaged-battery program specifics.
  • Health Canada recalls.
  • EU 2023/1542 dates (from prior knowledge, flagged).
  • SMC Racing storage and "True Spec" definitions; SkyRC and ToolkitRC street prices; LiHV guidance from Gens Ace and SMC themselves.