IVG Pro 12 battery life tested across a full working week

The IVG Pro 12's marketing line is "up to two days of use on a single charge", which is technically true for very light users but misleading for the typical buyer. "Up to" is doing heavy lifting in that claim; the realistic answer is closer to one full day for most people. We've tested the device across a working week with three different usage patterns, charged it from empty using five different USB power sources, and tracked the discharge curve hour by hour for a typical 24-hour cycle. This page is the data; if you're trying to decide whether the Pro 12 will see you through a workday without charging, you'll have a clear answer by the end.

This page covers four things. The 24-hour discharge curve as a visual chart, showing where the battery falls fastest and where it plateaus. Three user profiles, with hours of life and daily charging frequency for each. The charging-source comparison, so you know whether your existing USB-C plug is fast enough. And the battery longevity question, which matters for the 12-to-18-month lifespan of the device body itself rather than just one daily cycle.

Methodology: we used a freshly-charged IVG Pro 12 with a new 12ml pod-and-container set, vaped it through a normal working day, recorded battery indicator state every two hours, and repeated across multiple days with light, typical, and heavy usage patterns. The chart below is averaged from three "typical user" days; numbers vary 10 to 15% in real use, but the curve shape is consistent across all our test sessions.

What the curve actually shows

Two things to notice in the chart above. The first half of the battery lasts longer than the second half: roughly nine hours to drop from 100% to 50%, but the second half from 50% to 0% takes only about thirteen hours. This is normal lithium-ion behaviour; the cells discharge non-linearly under sustained load. Once you cross the 30% threshold, the LED indicator starts flashing more frequently and the device will eventually cut off vapour production well before the cell hits true zero, to protect the battery from deep discharge damage.

The second observation: "battery dead" doesn't quite mean zero. The Pro 12 has a low-voltage cutoff that stops the device firing at around 5 to 8% indicated battery, even though there's a small reserve in the cell. This is a feature, not a bug; it preserves the battery's long-term health. It also means you have around an hour of usable warning between the LED first flashing red and the device refusing to fire, which is enough time to get to a USB-C cable in most circumstances.

"The honest framing is that the IVG Pro 12 was designed around the typical-user profile. Light users get more than they need; heavy users get less than they want. Most people sit in the typical column and the device works as intended."

The "two days" claim, fairly

IVG's marketing line that the device lasts "up to two days on a single charge" is accurate for the light user profile but generous for everyone else. For the typical 15-to-20-a-day user, expect one full day with comfortable margin, not two. The device is sized correctly for ex-smokers transitioning from a pack-a-day cigarette habit; it's not sized for chain-vapers or heavy nicotine users, who would benefit from larger-battery alternatives. We compare the Pro 12 to other popular pod kits in our side-by-side test page.

The other variable people miss: battery life shrinks as the device ages. A six-month-old Pro 12 will give noticeably less daily runtime than a fresh one, and a year-old device may struggle to make it through a working day. We cover the lifecycle question in detail below.

What the charging test tells you

The Pro 12 doesn't need a fancy charger. Anywhere from 18W upwards gets you the same 30-to-35 minute charge time; the battery itself is the limiting factor, not the source's power output. If you have a modern USB-C wall plug from any phone made in the last few years, you're getting full speed. If you're using a laptop port or a power bank, expect 5 to 15 minutes of additional time but no functional difference. The only meaningfully slow option is the old 5W USB-A plugs, where the lower current means roughly double the charging time.

The practical takeaway: any USB-C cable plus any modern USB-C plug will charge the device in under 45 minutes. We sell USB-C cables at the counter for £2.99 if you don't already have one. The most common reason customers come back asking why their device isn't charging properly turns out to be a damaged cable or a USB-A-to-USB-C adapter that's restricting current.

Long-term battery health

Lithium-ion cells degrade over time. The Pro 12's 1000mAh cell typically retains around 80% of its original capacity after 300 to 500 charge cycles, which translates to roughly 12 to 18 months of daily charging for a typical user. After that, you'll notice the daily runtime starts shortening; what was 22 hours when new becomes 17 or 18, then 15 over the following months. The device continues working past this point, but the practical case for replacing the battery body strengthens as runtime shrinks.

Three habits extend battery health meaningfully:

• Don't drain to zero regularly. Plugging in around 20% rather than letting the device cut off is gentler on the cell.
• Don't leave plugged in overnight constantly. Once full, the cell is happier disconnected. Trickle-charge cycles add minor wear over time.
• Avoid extreme temperatures. Don't leave the device in a hot car in summer or a cold pocket in winter; either accelerates capacity loss.

None of these are dealbreakers; even ignoring all three, you'll get a year out of the device. They're just the difference between getting 12 months of solid runtime and getting 18.

The short version

• Typical user gets 18 to 24 hours per charge; light users 30 to 36; heavy users 10 to 14.
• Discharge is non-linear: first half of the battery lasts longer than the second half.
• Full charge takes 30 to 45 minutes from empty via USB-C; the source matters less than you'd think.
• Any modern USB-C wall plug hits maximum speed; only old 5W USB-A plugs are noticeably slow.
• Battery body lifespan: 12 to 18 months of typical daily use before noticeable runtime shrink.
• Three habits (avoid full discharge, avoid overnight trickle, avoid temperature extremes) extend battery life meaningfully.