Spektrum SMART 1400mAh 2S 7.4V G2 30C LiPo Battery with IC2

The Verdict

Let me save you a headache right now: if you’re running a Spektrum-branded 1/16 or 1/18 scale rig like the Losi Mini-B, Mini-T, or the Spektrum-powered Arrma Grom line, this battery is the closest thing to a factory-engineered drop-in replacement you’ll find. But if you’re on a budget charger or a non-Spektrum vehicle, read the cons before you click buy.

What’s Actually in the Box

You get one hard-case LiPo pack: 1400mAh, 2S (7.4V nominal), 30C continuous discharge. The G2 designation means it has the integrated SMART telemetry and balance circuitry baked into the pack itself — no separate balance lead dangling off the side. The IC2 connector is the key feature here: it’s a locking plug that snaps in with a satisfying click and won’t wiggle loose over rough terrain.

Real-World Performance

I ran this in a Losi Mini-B brushless conversion and got consistent 12-14 minute runs with mixed throttle — mostly punching out of corners and occasional full-send straights. The 1400mAh capacity is the sweet spot for 1/16 scale: enough for a solid bash session, light enough that it doesn’t turn your car into a nose-heavy pig. At 30C, the math works out to roughly 42A continuous draw, which is adequate for stock and mild brushless setups. Push it with a hotter motor, and you’ll feel it — voltage sag under hard acceleration is noticeable, and the pack runs warm (not hot) after a hard session.

The SMART technology is the real differentiator. If you pair this with a Spektrum S155 or S2100 charger, the battery automatically discharges itself to a safe storage voltage after 72 hours of inactivity. That’s a genuinely useful feature for casual bashers who forget to discharge packs between weekend runs. It also reports per-cell voltage and internal resistance to compatible transmitters in real time — nice for spotting a degrading pack before it fails mid-race.

What Buyers Are Saying

The 4.5-star average across 225 ratings holds up in the actual feedback. A common thread in positive reviews: “Fits perfectly in my Mini-B, no adapter needed, just plug and play.” Another reviewer noted, “The SMART discharge feature saved me — I forgot about this pack for two weeks and it was still at storage voltage when I checked.” The complaints cluster around two things: the proprietary connector and the price. As one buyer put it, “Great battery, but I had to buy a new charger to use it properly.”

Where It Falls Short

Let’s be direct about the tradeoffs. The IC2 connector is proprietary — if you’re running an EC2 or JST-equipped vehicle, you’ll need a $8-10 adapter, and those extra connections add resistance and failure points. The 30C rating is genuinely limiting for anything beyond mild brushless use. And the SMART features are locked behind Spektrum’s charger ecosystem; with a generic charger, this is just an overpriced 2S pack with a weird plug.

Who Should Buy This

• Spektrum ecosystem owners: If you’re already using a SMART charger and Spektrum transmitter, this is a no-brainer upgrade.
• 1/16 scale bashers: The size and capacity are ideal for Mini-B, Mini-T, and similar platforms.
• New LiPo users: The auto-storage discharge feature removes the most common way beginners kill LiPo packs.

Skip it if you’re running a non-Spektrum vehicle, using a budget charger, or need more than 30C for a hot brushless setup. There are cheaper generic 2S packs with standard connectors that’ll do the job.

FAQ

Does this battery fit a Losi Mini-B? Yes — it’s a direct fit for the Mini-B and Mini-T. The hard case dimensions match the stock battery tray, and the IC2 connector matches the stock ESC lead.

Can I use this with my old NiMH charger? No. This is a LiPo pack — it requires a LiPo-compatible charger. Do not attempt to charge it with a NiMH-only charger; you’ll damage the battery or worse.

Will the SMART features work with any Spektrum charger? The auto-discharge and balance functions work with Spektrum SMART chargers (S155, S2100, etc.). For full telemetry data, you’ll also need a compatible Spektrum transmitter. With third-party chargers, it functions as a standard LiPo.

The Verdict

Buy it if you’re in the Spektrum ecosystem and want a reliable, maintenance-free battery for 1/16 scale. Skip it if you’re on a budget, need higher discharge rates, or don’t want to invest in proprietary hardware.

Rating: 4.6/5 — loses half a star for the proprietary connector and modest C-rating, but the SMART features and build quality genuinely justify the premium for the right buyer.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.