The RC Battery Connector Landscape
The XT page covers the XT30/60/90 ecosystem in depth. This page answers the question that comes right before it: "what connector is on this battery?" RC packs, chargers, ESCs, and vehicles ship with half a dozen incompatible power-connector ecosystems, most of them clone-heavy, and the fleet you inherit is usually mixed. Identify first; then standardize deliberately.
Apart from the sourced Anderson Powerpole example below, this page gives no current ratings. Deans-style, EC-style, Traxxas-style, Tamiya-style, and bullet connectors are mostly sold as clones with marketing numbers attached. Treat every amp figure as unverified until you find the manufacturer document for the exact part in your hand. The XT page shows what a sourced rating looks like—and how much the test conditions matter.
The identification table
| You're holding | ID marks | Where you meet it | Watch out |
|---|---|---|---|
| Deans-style / "T-plug" | Two flat blades in a T, red shell | Older LiPo packs, park flyers; the genuine article is the W.S. Deans "Ultra Plug" — the original T-plug1 | "T-plug" listings are clones of varying blade thickness and spring force; a loose mate heats at max current |
| EC3 / EC5 (and IC3 / IC5) | Blue/black shell molded over 3.5 mm / 5 mm bullets | Horizon Hobby ecosystem (E-flite, Spektrum); IC-series are the newer Smart-telemetry versions marketed as EC-mateable | Shell is the polarization; the bullets inside are the contacts. Verify IC↔EC mating claims against Horizon's own documentation before mixing |
| Traxxas-style | Flat high-current blades in a keyed shell with a latch tab | Traxxas vehicles and packs | Proprietary ecosystem; clone "Traxxas-compatible" quality varies widely |
| Tamiya-style | White nylon 2-pin shell, one chamfered corner | Older NiMH packs, budget chargers, toy-grade vehicles | The classic upgrade-me connector: high-resistance reputation, loose fits, and polarity that must be verified per pack — the shell keying does not guarantee the wires inside |
| Bare bullet trios (2–8 mm) | Individual gold barrel connectors under heat-shrink, usually ×3 | Motor↔ESC three-wire connections; big packs use 6–8 mm singles (anti-spark AS150-style on large aircraft) | No housing means no polarization — motor leads are swappable by design, but battery leads are not; insulate every joint fully |
| MR30 / MT30 / MT60-style trios | Keyed three-pin housings over bullet contacts | Motor↔ESC where builders want keyed, one-action disconnects; same AMASS-originated ecosystem as XT2 | Same clone caveats as XT; digits in the name are not verified ratings |
| Anderson Powerpole (PP15/45) | Genderless single-pole housings that dovetail side-by-side, contact visible in the face | Bench supplies, amateur radio, combat robotics, power distribution | Now has a full deep dive — the system, the family ladder, and the orientation discipline that stands in for polarization |
| JST-RCY (red pair) | Small red 2-pin latched pair | Light loads, small packs | Not a high-current connector — see the families capsule and JST Is Not One Connector |
| XT30 / XT60 / XT90 | Yellow keyed shell, 2 bullet contacts, size steps | The de-facto standard for modern LiPo packs | The digits are momentary current per AMASS — the XT page has the sourced table |
Face-on ID silhouettes — shape and blade/bullet geometry are the fastest tell. Schematic only; sizes not to scale between connectors.
The one sourced row: Anderson Powerpole
Anderson Power Products' PP15/45 Powerpole family is the documented outlier in this landscape: 15 A, 30 A, and 45 A contacts all share the same genderless housing, covering #20 through #10 AWG, with the series rated up to 55 A per pole per Anderson's product specifications — and housings dovetail together so you build multi-pole connectors from single poles.3 That's why bench supplies and radio shacks standardize on it. The trap is the flip side of genderless: nothing but your assembly convention (the agreed red/black stacking arrangement) polarizes the connection. The full system — the family ladder above 45 A, the standardized orientation, assembly discipline, and why it's the wrong answer for signal — now has its own page: the Anderson Powerpole deep dive.
Traps
- The adapter drawer. A mixed fleet breeds adapters, and every adapter is two more connections, more resistance, and a hiding place for a bad joint — right in the highest-current path you own. Standardize the fleet on one ecosystem (calculated against your loads) and re-terminate; keep adapters for the charger bench, not the vehicle.
- Unplugging under load. Battery DC arcs. Same rule as everywhere in both guides: de-energize first, and prefer anti-spark variants on high-capacity packs. See power vs signal and the energized-connector warning.
- Solder joints are the connector. Most of these families use solder tabs or cups. A cold joint or wicked-stiff wire at the tab fails before the connector does — strain-relieve with heat-shrink past the joint, every time.
- Polarity is your job. Tamiya-style shells and bare bullets carry no trustworthy polarity convention, and even keyed shells only guarantee orientation, not that the pack was wired correctly. Meter the pack before its first connection to anything expensive.
- Clone roulette, again. Blade thickness, bullet spring force, plating, and shell fit vary between clones of every family here. Buy matched pairs from one source and inspect the mate.
When to move to the engineering track
Fielded vehicles, bigger packs, or anything where load-break, touch safety, and fault current need documented answers: the high-current DC path (where Powerpole's bigger sibling, the Anderson SB family, lives), rugged on a budget for sealed vehicle wiring, and When Hobby Connectors Are Not Enough.
Source status
Anderson PP15/45 figures are cited to Anderson's own product specifications,3 the Deans/T-plug originator claim to W.S. Deans' own site,1 and the MR/MT ecosystem attribution follows the AMASS sourcing on the XT page.2 Everything else on this page is identification-level and deliberately rating-free — EC/IC (Horizon Hobby) and Traxxas publish limited public spec documentation, and clones dominate the market; source targets are tracked in Hobby Source Notes.