JNR P5 GlassRock 100K Review — Bigger Battery, Better Build, Worth It?

The JNR P5 GlassRock 100K is JNR's second-generation 100K system, and the upgrades address nearly every weakness of the P4 Stellarc: bigger battery, adjustable airflow, transparent body, and a claimed 3× coil lifespan. On paper, it's the Stellarc with every slider moved to the right. In practice, it's a more refined device that trades portability for power — and whether that trade-off works for you depends entirely on how you vape.

I used the GlassRock daily for three weeks alongside the Stellarc, running both through the same flavors to get a direct comparison. This review covers real-world battery endurance, coil longevity claims vs reality, the transparent design's practical value, and whether the GlassRock justifies the $1 premium over the Stellarc.

Full Specifications

Spec	JNR P5 GlassRock 100K
Puff Count (Claimed)	Up to 100,000
Puff Count (Tested)	~8,000–9,000 per pod
Total E-Liquid (Kit)	64mL (2 × 2mL pods + 2 × 10mL containers + 4 × 10mL bottles)
Battery	1,900mAh (built-in)
Charging	USB-C
Coil	1.2Ω dual mesh (3× lifespan claim)
Airflow	Adjustable airflow control
Display	Smart battery screen (battery %, puff count)
Body	Transparent GlassRock design with e-liquid window
Nicotine (US)	5% (50mg) nicotine salt
US Flavors	10 (same lineup as P4 Stellarc)

What's in the Box

Identical kit contents to the Stellarc — JNR kept the packaging formula the same:

• 1 × battery unit (with built-in 1,900mAh battery and smart screen)
• 2 × pre-filled pods (2mL each, two different flavors)
• 2 × 10mL refill containers (one per pod)
• 4 × 10mL e-liquid bottles (two bottles per flavor)
• 1 × USB-C charging cable
• Quick start guide

Same 64mL total juice, same dual-flavor setup, same refill bottle pairing. If you've unboxed a Stellarc, you know exactly what to expect here — the only hardware difference is the device itself. For the full flavor catalog, see our JNR Vape Flavors guide.

Design & Build Quality

The GlassRock is a completely different visual identity from the Stellarc. Where the P4 goes for a sleek, tech-gadget aesthetic with its animated curved screen, the P5 leans into a bold, industrial-transparent design. The body is partially see-through, letting you watch e-liquid levels in the pod and refill container through the transparent panels. It's both functional and genuinely good-looking — the kind of device that invites questions from other vapers.

The device is noticeably larger and heavier than the Stellarc. It's still pocketable in cargo pants or a jacket, but it won't disappear into slim jeans the way the P4 does. The extra bulk is the price of the 1,900mAh battery. If you carry a bag or use a vape holster, the size is a non-issue. If pocket carry is essential, the Stellarc is the better choice.

Build quality is a step up from the Stellarc. The magnetic pod connection feels firmer — I couldn't dislodge pods through normal handling, even deliberate shaking. The transparent panels are made of a polycarbonate-style material that resists scratching better than I expected after three weeks of pocket carry. The smart screen is less flashy than the Stellarc's animated display (no starlight animations, just clean data readouts), but it's more practical — battery percentage and puff count are always visible at a glance.

The 1,900mAh Battery — A Genuine Game Changer

This is the GlassRock's biggest upgrade and the primary reason to choose it over the Stellarc. Here's my real-world charging log:

Usage Level	Stellarc (1,200mAh)	GlassRock (1,900mAh)
Light (100–150 puffs/day)	Charge every 2–2.5 days	Charge every 3.5–4 days
Moderate (200–300 puffs/day)	Charge every 1.5–2 days	Charge every 2.5–3 days
Heavy (500+ puffs/day)	Charge daily	Charge every 1.5–2 days

At moderate use, the GlassRock consistently gave me an extra full day between charges compared to the Stellarc. That doesn't sound dramatic on paper, but in practice it means the difference between "charge it when you remember" and "charge it every night." USB-C charging time is slightly longer — about 90–120 minutes from empty to full, compared to the Stellarc's 60–90 minutes.

One important difference: the GlassRock's battery is built-in, not detachable like the Stellarc's. You can't replace just the battery module if it degrades over time. For most users this won't matter within the realistic lifespan of the device, but it's worth noting if long-term repairability matters to you.

Adjustable Airflow — Does It Matter?

The Stellarc has a stepless airflow ring. The GlassRock also has adjustable airflow, but with more defined notches and a wider range of adjustment. In practical terms:

Fully closed: A tight, cigarette-style MTL draw. Flavor is concentrated and dense. Best for bold flavors like Blue Razz Ice or Lemon Heads where you want maximum intensity per puff.

Mid-range: A balanced restricted DTL draw that's the sweet spot for most vapers. Good vapor production with solid flavor. This is where I kept it 90% of the time.

Fully open: Airier draw with increased vapor volume but diluted flavor. Best for Miami Mint or Watermelon Ice where a lighter profile works well.

The airflow range is wider than the Stellarc's — the fully-closed setting is tighter, and the fully-open setting is airier. If you're the type who tweaks draw resistance to match different flavors or moods, the GlassRock gives you meaningfully more control. If you set airflow once and forget about it, this won't matter much.

Coil Longevity — The 3× Lifespan Claim

JNR markets the GlassRock's 1.2Ω dual mesh coil as lasting three times longer than standard coils. That's a bold claim. Here's what I actually measured:

Milestone	Puff Count	Notes
Fresh pod	0	Pre-filled, full flavor
First refill container empty	~2,500	Flavor identical to first puff
Second refill	~5,000	Still excellent — no detectable degradation
Third refill	~7,200	Very slight warmth in flavor, barely noticeable
Noticeable decline	~8,000	Flavor starting to mute
Burnt taste	~8,500	Time to swap pod

My GlassRock pod lasted approximately 8,500 puffs before hitting burnt territory — roughly 1,000 more puffs than the Stellarc's ~7,500. That's a 13% improvement, not 300%. The "3× lifespan" claim likely compares against standard single-mesh coils from other brands, not against JNR's own Stellarc. It's better, but the marketing oversells the advantage.

Where the GlassRock coil does noticeably outperform is in the 5,000–7,000 puff range. The Stellarc's flavor started dropping around puff 6,000; the GlassRock maintained near-peak quality until about 7,200. That extra 1,200+ puffs of peak flavor is the real benefit — the tail end before burnt taste is just a bonus.

Transparent Body — Practical or Gimmick?

Surprisingly practical. Being able to see the e-liquid level in both the 2mL pod tank and the 10mL refill container means you always know when a refill is coming. With the Stellarc, I occasionally got caught off-guard by an empty container mid-session. With the GlassRock, I could see the juice level dropping over days and plan my refills.

The transparent design also makes it easier to spot assembly issues. If the pod and container aren't seated correctly, you can see juice pooling in the wrong place — on the Stellarc, you'd only discover misassembly when juice leaks or you get a dry hit. For first-time JNR users, this visual feedback is genuinely helpful during the learning curve. For setup instructions covering both devices, see our how-to guide.

Scoring Breakdown

Category	Score	Notes
Build Quality	8.5/10	Stronger pod connection than Stellarc; scratch-resistant transparent body
Flavor	9/10	Same formula, slightly longer peak flavor window
Battery Life	9/10	1,900mAh is best-in-class for pod-style disposables
Value	8.5/10	$24.99 is $1 more than Stellarc — justified by battery and build
Ease of Use	8/10	Transparent body makes assembly more intuitive than Stellarc
Portability	7/10	Noticeably bulkier; pocketable but not discrete
Overall	8.4/10

GlassRock vs Stellarc — Side-by-Side Verdict

Category	Winner	Why
Battery Life	GlassRock	1,900 vs 1,200mAh — extra full day between charges
Portability	Stellarc	Smaller, slimmer, fits in any pocket
Coil Longevity	GlassRock	~8,500 vs ~7,500 puffs per pod
Airflow Control	GlassRock	Wider range with better-defined settings
Screen / Display	Stellarc	Animated curved screen is more engaging
Build Durability	GlassRock	Stronger pod connection, more robust overall
Battery Replaceability	Stellarc	Detachable battery module; GlassRock is built-in
E-Liquid Monitoring	GlassRock	Transparent body shows juice levels in real-time
Price	Stellarc	$23.99 vs $24.99 — marginal difference
Flavor Quality	Tie	Same formula, same coil spec, near-identical taste

Bottom line: The GlassRock wins 5 categories to the Stellarc's 3, with 1 tie. If you're buying your first JNR device and don't have a strong preference for portability, the GlassRock is the better overall pick at only $1 more. If you already own a Stellarc and are considering the upgrade, the battery life improvement alone justifies it — especially for heavy vapers. For the complete JNR brand overview covering both systems, see our pillar guide.

How the GlassRock Compares to Competitors

	JNR P5 GlassRock	Foger	Lost Angel Mate 50K
Battery	1,900mAh	650mAh	900mAh
Puffs Per Pod (Real)	~8,500	~4,000–5,000	~5,000–6,000
E-Liquid Per Kit	64mL	16mL	32mL
Refillable?	Yes (auto-feed)	No	No
US Flavors	10	28+	23
Kit Price	$24.99	$24.99	$22.99
Replacement Pod	$21.99	$12.99	$14.99

The GlassRock dominates on hardware specs — triple the battery capacity of Foger, double the juice volume of Lost Angel. But it loses on flavor variety (10 vs 23–28) and replacement pod cost ($21.99 vs $12.99–$14.99). The per-puff cost evens out because JNR pods last significantly longer, but the upfront replacement expense is higher. For a deeper pod-system comparison, see JNR vs Foger Vape.

Who Should Buy the GlassRock (And Who Shouldn't)

Buy the GlassRock if: Battery life is your top priority, you appreciate build quality and design, you want the most refined JNR experience, and you don't mind carrying a slightly larger device. The transparent body makes it the better choice for JNR first-timers thanks to visual assembly feedback.

Skip the GlassRock if: You prioritize compact size above all else (get the Stellarc), you want a detachable/replaceable battery module (Stellarc only), or you want a zero-maintenance disposable (try RAZ or Geek Bar).

Where to Buy

We carry the P5 GlassRock Kit ($24.99) and replacement pods ($21.99) with free shipping on orders over $80. Ships from Memphis, TN with 2–5 business day delivery.

Shop P5 GlassRock Kit →

Shop P5 Replacement Pod →

Also available at local vape shops — see our JNR Vape Near Me page for other options and JNR Vape Price for cost comparison data.

Frequently Asked Questions

Is the GlassRock better than the Stellarc?

In most categories, yes — better battery (1,900 vs 1,200mAh), stronger build, longer coil life, adjustable airflow, and transparent body. The Stellarc wins only on portability, screen aesthetics, and battery replaceability. For $1 more, the GlassRock is the better overall device.

Can I use Stellarc pods in the GlassRock?

No. P4 Stellarc and P5 GlassRock pods are physically different and not cross-compatible. Each device requires its own specific replacement pods.

How long does the GlassRock battery last?

At moderate use (200–300 puffs/day), 2.5–3 days between charges. Light vapers can stretch to nearly 4 days. Heavy vapers (500+ puffs/day) will charge every 1.5–2 days. Full charge takes 90–120 minutes.

Does the 3× coil lifespan claim hold up?

Compared to other brands' standard coils, it's plausible. Compared to the Stellarc's coil, the improvement is about 13% (8,500 vs 7,500 puffs). The bigger real-world benefit is an extended peak-flavor window — the GlassRock coil maintains top flavor quality about 1,200 puffs longer than the Stellarc.

Is the transparent body durable?

Yes. After three weeks of daily pocket carry, the polycarbonate-style panels showed minimal scratching. It's more durable than it looks. The transparent sections don't feel fragile or cheap.