Nikon designed the D500 body without any in-body charging capability, so plugging a USB cable directly into the camera will not refill the EN-EL15 battery. The EN-EL15 lithium-ion cell ships with a dedicated external charger (Nikon MH-25a, or the older MH-25) that pulls current from a wall outlet, and that single piece of hardware is the only path the manufacturer designed for topping the cell up.
The USB port on the D500 routes strictly to data transfer, so plugging the camera into a laptop or wall adapter moves files but never electrons into the battery.
This guide explains why the Nikon D500 can’t top off its EN-EL15 internally and walks through the right external charger, step-by-step juicing, and travel-friendly alternatives for photographers working off-grid.
The D-LI50 Was Never Built for Internal Charging
Before USB Power Delivery became a household term in 2015, camera manufacturers locked batteries behind proprietary chargers, and Pentax was no exception. The D-LI50 cell (sometimes labeled D500 by third-party sellers) was engineered in tandem with bodies like the K20D, K-7, and GX-20, all of which rely on an external cradle that drops current across gold-plated contacts.
There is no internal charge circuit on the camera’s mainboard, so even a perfectly healthy USB port cannot push energy into the cell.
That architecture matters because it explains every frustration that leads owners to this question. The body is engineered to use a charged battery, not to create one. Treat the D-LI50 like a fuel can for a generator, not a phone battery that doubles as a power bank. The only safe path from empty to full runs through a wall outlet and a dedicated D-BC50 cradle.
Why USB Charging Wasn’t Even an Option
USB 2.0, the standard baked into early-2000s cameras, could only push 500 mA at 5 V, a fraction of what a lithium-ion cell needs for a healthy charge cycle. Engineers would have needed a boost converter, charge-controller IC, and thermal monitoring circuitry, none of which existed on the K-series mainboard. Adding them now would require a hardware revision that Pentax and Ricoh have never released, and aftermarket modifications routinely void warranties.
Which Pentax and Ricoh Models Use the D-LI50
The D-LI50 / D500 cell appears in a small but well-defined cluster of mid-2000s DSLRs. Every camera on this list shares the same charging reality: an external D-BC50 cradle is the only sanctioned path, and none of the bodies carry the USB Power Delivery contacts or charge-management chips that modern mirrorless cameras rely on.
| Camera Model | Manufacturer | Release Year | Internal Charging? |
|---|---|---|---|
| K20D | Pentax | 2008 | No |
| K-7 | Pentax | 2009 | No |
| GX-20 | Samsung | 2008 | No |
| K200D | Pentax | 2008 | No |
If your body appears here, an external unit is the only legitimate answer. Cross-shopping chargers from other Pentax lines won’t help either, since the D-LI50’s voltage profile (7.2 V nominal, 8.4 V at full charge) is unique to this generation.
Spotting Counterfeit and Mislabeled Cells
Aftermarket sellers sometimes relabel generic lithium-ion packs as “D500” or “D-LI50 compatible” without matching the original 7.2 V chemistry or 1500 mAh capacity. Check the cell’s printed label against the Pentax datasheet before you buy. A genuine D-LI50 weighs roughly 78 g and carries a Pentax or Ricoh logo. Anything noticeably lighter, or wrapped in plain shrink-wrap without a holographic sticker, is almost certainly a counterfeit.
The OEM Charger You Should Trust
The Pentax D-BC50 is the manufacturer-specified charger for the D-LI50 and remains the safest factory-blessed option. It carries the correct voltage regulation (8.4 V cutoff), a temperature sensor that pauses charging if the cell overheats, and reverse-polarity protection that prevents damage if the battery is seated incorrectly. Buy the OEM unit whenever budget allows, especially if your camera still carries an active warranty.
Warning: Flickering indicator lights, excessive heat during a charge cycle, or a missing CE/UL mark on the charger’s housing all signal a third-party unit that hasn’t been properly regulated. Unplug immediately and recycle the charger at a certified e-waste facility.
Third-party D-BC50 replacements exist at lower prices and range from solid to dangerous. Reputable brands like Wasabi Power publish independent test data and ship chargers with over-voltage protection. Sketchy units sold through anonymous marketplace listings frequently omit the thermal cutoff, which can swell the cell or, in extreme cases, trigger thermal runaway.
What a Quality Third-Party Unit Looks Like
Look for a charger that lists its output as 8.4 V at 600 mA (or close to it), carries a visible CE marking, and ships with a removable AC cable rather than a hardwired wall plug. A one-year warranty is a strong sign the manufacturer stands behind the regulation circuitry. Avoid anything that promises charging in under 90 minutes, since lithium-ion chemistry in this form factor cannot absorb current that quickly without heat damage.
Once you’ve identified a legitimate OEM charger, the procedure itself determines whether the cell reaches its full lifespan.
Step-by-Step: Charging the D-LI50 the Right Way
Charging the D-LI50 correctly takes about two and a half hours from empty to full and follows the same rhythm whether you shoot Pentax, Samsung, or Ricoh bodies. Skipping any of the steps below risks shortening the cell’s service life or, worse, damaging the camera’s power regulation circuit.
- Power down the camera. Switch the body off and wait five seconds for the mainboard capacitors to discharge before removing the cell.
- Inspect the contacts. Wipe the gold pads on the battery and inside the D-BC50 cradle with a dry microfiber cloth to remove dust, oil, or oxidation.
- Seat the battery. Drop the cell into the cradle with the contacts facing down, matching the polarity arrows molded into the plastic.
- Plug into a stable outlet. Connect the D-BC50 to a wall socket rather than a power strip, which can deliver inconsistent voltage.
- Watch the indicator LED. A steady red light means the cell is charging; green (or LED off on some units) signals a full charge.
- Unplug promptly. Pull the cell from the cradle once the light turns green; leaving it on the charger for days creates trickle-current stress.
Charge time runs roughly 150 minutes from a complete drain, faster if you top off between sessions. Heat is the enemy: never charge inside a hot car, near a radiator, or in direct sunlight. Lithium-ion chemistry degrades fastest above 40 °C (104 °F).
Reading the Indicator Lights Correctly
A blinking red light usually means the contacts are misaligned; reseat the battery and try again. A light that never moves off red after four hours typically signals an aging cell that can no longer hold a full charge or a charger with a blown fuse. Test the cell in the camera: if the body shuts off within a few minutes despite a “full” indicator, retire the battery and replace it with a fresh D-LI50.
Travel and Field Charging Alternatives
Road warriors often need a way to top up away from a wall outlet, and a regulated 12V car adapter or power bank can keep you shooting if you match the charger’s input spec. The D-BC50 accepts 100–240 V at 50–60 Hz, which means most travel adapters work, but only with the right plug shape, never with a voltage converter.
Tip: A regulated power bank rated at the charger’s specified input voltage can keep you topped up on the road, but raw solar panels and unregulated 12V car adapters can push damaging voltage into the cell. Always verify the output rating before plugging in.
For international travel, confirm the D-BC50’s input range before relying on a simple plug adapter. Most OEM units handle 100–240 V automatically, which covers North America, Europe, Asia, and Australia without a voltage converter. A lightweight international adapter kit is far safer than a step-up transformer, which can spike the current and cook the cradle’s regulation board.
Spare Batteries Beat Field Charging Every Time
Carry two or three spare D-LI50 cells rather than relying on improvised charging if you shoot professionally or in remote locations. Lithium-ion packs lose roughly 20% of their capacity per year even when unused, so rotate your stock and label each cell with the purchase date. Spare batteries keep you shooting through cold weather (which temporarily saps capacity) and long event days without hunting for an outlet.
But even careful ownership can’t prevent every fault, and some packs simply stop accepting current altogether.
Diagnosing Batteries That Refuse to Charge
A battery that reads full immediately, dies within minutes, or refuses to leave the red indicator likely has a few hundred cycles on it. Most D-LI50 cells survive 300–500 full charge cycles before capacity drops below 70%, which is the threshold where retired cells begin affecting your shoot. Test the cell in your camera: if the body shows full bars and shuts off within five minutes, retire the battery.
Swelling, leakage, or a chemical smell means stop using the battery now and dispose of it through a certified e-waste channel. Lithium-ion cells that vent hydrogen fluoride can damage skin and lungs, so never throw a swollen pack into household trash. Most camera stores and electronics retailers accept damaged cells for free recycling.
Quick Troubleshooting Checklist
- LED never turns green: Clean the cradle contacts with isopropyl alcohol and reseat the battery; if the light still holds red after four hours, replace the cell.
- Battery shows full but dies fast: Capacity has degraded past the 70% threshold; retire the cell and buy a fresh D-LI50.
- Charger gets unusually hot: Unplug immediately and inspect for melted plastic or a burnt smell; replace the charger before using it again.
- Camera shows “battery depleted” on a full cell: Clean the body-side contacts with a dry cotton swab; the issue is oxidation rather than the battery.
The Bottom Line
The D-LI50 (D500) battery cannot be charged inside the camera, and the USB jack on every Pentax and Ricoh body that uses it is wired for data only. The Pentax D-BC50 remains the safest charger, while regulated third-party units from brands like Wasabi Power offer budget-friendly alternatives that match OEM specs.
Pair the right cradle with clean contacts, a stable outlet, and prompt unplugging once the green light shows up, and a fresh D-LI50 will deliver reliable power for years of shooting.
FAQ
Can the Nikon D500 be charged through USB?
No. The USB port on the Nikon D500 is wired for data transfer only and does not deliver charging current to the EN-EL15 battery. The camera has no internal charge circuitry, so any power routed through the USB jack moves files but never fills the battery.
How do you charge a Nikon D500 battery?
Remove the EN-EL15 from the camera body and place it in an MH-25 or MH-25a charger connected to a wall outlet. Expect about two hours and thirty-five minutes from a complete drain. The charger LED turns from red to green once the cell reaches full capacity.
Does the Nikon D500 come with a battery charger?
Most retail kits ship with an MH-25a charger in the box, but some refurbished bodies and import models are sold body-only. Check the seller’s listing before purchasing; an MH-25a alone typically runs around $50 if you need to buy one separately.
Can I use a third-party battery in the Nikon D500?
Yes, third-party EN-EL15 cells from reputable brands work in the D500, though the camera may show a “battery info” grayed-out state and refuse to log the cell’s wear level. Nikon warns that damaged or unregulated third-party packs can affect performance and void coverage on the battery itself.
How long does it take to charge a Nikon D500 battery?
A full charge from empty takes roughly 2 hours and 35 minutes using the MH-25a. Topping off a partially drained battery is correspondingly faster, usually under 90 minutes if the cell started above 50%.
What charger does a Nikon D500 use?
Nikon pairs the EN-EL15 lithium-ion pack with its dedicated MH-25a wall charger, which ships alongside most D500 kits. The MH-25a is backward compatible with original EN-EL15 cells, so older batteries charge without issue on the newer cradle.
