Why mAh Is a Lie — And What to Look At Instead
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You're 20 minutes from the last dance. Bride and groom are about to hit the floor for the song they've been planning since the venue deposit cleared. You've had 12 uplights washing the room in their exact shade of dusty rose all night.
Then one goes dark. Then another.
If you've been shopping for battery uplights by mAh alone — or trusting a listing that says "10,000mAh! All-night battery!" — this scenario isn't hypothetical. It's a math problem you didn't know you were getting wrong.
Here's what's actually happening, and how to shop (and plan) smarter.
The mAh Trap
mAh (milliamp-hours) measures electrical charge — specifically, how much current a battery can deliver over time at a given voltage. A 10,000mAh battery sounds like a lot. And compared to your phone battery (typically 3,000–5,000mAh), it is.
But here's the problem: mAh only tells half the story. The other half is voltage. And when you're comparing uplights from different manufacturers, the voltages are almost never the same.
A fixture running a 3.7V battery pack and a fixture running an 11.1V battery pack can both advertise "10,000mAh." They will not run for the same amount of time. Not even close.
The 3.7V version holds about 37 watt-hours of usable energy.
The 11.1V version holds about 111 watt-hours — nearly three times as much.
Same mAh number. Completely different runtime.
The Number That Actually Matters: Wh
Watt-hours (Wh) measure energy — not just charge. The formula is:
Wh = (mAh × Voltage) ÷ 1000
And once you know Wh, calculating real runtime is straightforward:
Runtime (hours) = Wh ÷ Watts consumed
This is the number lighting designers, production companies, and anyone who's been burned by dead fixtures uses to evaluate gear. Airlines use it too — TSA regulations on lithium batteries are based on Wh, not mAh, because Wh is the honest measure of how much energy something actually stores.
When a manufacturer leads with mAh and buries (or omits) the voltage, that's a flag. Higher mAh numbers look more impressive in a listing title. "13,200mAh" sounds enormous — but without knowing voltage, it means nothing to you as a working DJ.
What This Looks Like on a Real Gig
A typical wedding reception runs 5–6 hours from venue load-in through last dance. In practice, your lights are probably on for 4–5 hours of that. Let's say you're running 12 uplights in a single color (dusty rose, of course) for most of dinner and dancing, then shift to a brighter mixed output for the last hour.
Here's where mode matters. Most quality battery uplights have two meaningfully different power states:
- Multi-color / dynamic mode (all LED channels active, full brightness): highest wattage draw, shortest runtime
- Single-color / static mode (one LED channel at reduced intensity): dramatically lower wattage draw, much longer runtime
A fixture advertising "6-hour battery life" almost certainly means 6 hours at single-color static mode — not 6 hours of vibrant dynamic RGBAW output. This distinction doesn't always make it into the listing description. It should.
The practical rule: if you're running single colors all night, your runtime window is wide. If you're running dynamic effects, color fades, or high-brightness max output for extended periods, your clock is ticking faster than the spec sheet implies.
Doing the Math Before You Buy
When comparing fixtures, request or calculate these three numbers:
- Battery voltage (V) — typically listed in specs, sometimes in the manual
- Battery capacity (mAh) — almost always listed
- Power consumption in your intended mode (W) — often listed as "max wattage"
Then:
- Wh = (mAh × V) ÷ 1000 → your total energy budget
- Runtime = Wh ÷ W → your realistic hours per charge
Example: A fixture with 8,800mAh at 7.4V gives you 65 Wh. Running 6×18W LEDs at full output (108W total, though actual draw is typically lower), you're looking at under an hour at true max. In realistic single-color use at maybe 15–20W, you'd stretch that to 3–4 hours.
That math matters when you're deciding whether to buy 8 fixtures or 12, whether to rent a charging cart, and whether you can safely skip recharging between an afternoon ceremony and an evening reception.
How IBEX Is Spec'd (And Why It's Relevant)
IBEX PAR uplights run a 6×20W LED array (RGBAW) on an 11.1V, 13,200mAh battery — which works out to roughly 146 Wh per fixture.
At MAX output (all channels, full brightness): approximately 4 hours
At single-color static mode: approximately 12 hours
The 4-hour MAX figure is the honest stress-test number. It means running all six LED emitters simultaneously at peak brightness — the mode you'd use if you wanted to throw the most light possible into a large ballroom. For most wedding uplighting work (a single color, set and forget, walls at 70% brightness), you're well into the 8–12 hour window.
The 146 Wh figure also gives you a benchmark for comparison shopping. If a competitor fixture lists 8,800mAh without specifying voltage — or lists a 3.7V or 7.4V pack — do the conversion before assuming you're getting comparable runtime. A bigger mAh number at half the voltage is a smaller battery.
We don't think you should buy gear based on spec sheets alone. But you should know what the spec sheet is actually telling you — and what it isn't.
The Pre-Gig Battery Checklist
Runtime planning isn't just a buying decision. It's a workflow habit. Here's what to build into your pre-event prep:
Top off every fixture the night before. Don't rely on "I charged them last week." Lithium-ion batteries lose a small amount of charge during storage.
Know your mode ahead of time. If the couple wants dynamic color changes during cocktail hour and first dances, that's higher draw. If you're setting a static color and leaving it all night, you have runway to spare.
Account for load-in time. If your lights go on at 3pm for a venue walkthrough and the last dance is at 10pm, that's 7 hours. Know your gear's Wh budget before you commit to that timeline without a mid-event recharge.
Bring a charger anyway. Even with 146 Wh per fixture, a power strip and your charging cables weigh almost nothing. If there's a 30-minute window during dinner, a partial top-up on your hardest-working fixtures is free insurance.
Don't trust "all-night" marketing claims. Run the math. If the listing doesn't give you voltage, ask the seller before you buy — or consider that they may not want you to do the comparison.
The Bottom Line
mAh tells you how much charge a battery holds at a specific voltage. Without knowing the voltage, it's a number without context — and in a market where manufacturers know that bigger numbers move product, it's easy to get misled.
Wh is the honest number. It accounts for both charge and voltage, it's directly convertible to runtime, and it lets you make apples-to-apples comparisons across different fixtures and brands.
Before your next gear purchase — or before your next gig — take five minutes to do the Wh math on what's already in your cases. You might find your runtime window is more comfortable than you thought. Or you might catch a problem before it catches you at the last dance.
Next up: what to do when the venue has exactly two outlets and sixteen uplights that need topping off before doors open.