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Olympus LI-50B mju 9010 Replacement Battery 3.7V 800mAh

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From $22.99 USD $28.99
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Fits Olympus mju 9010, mju Tough-6000, mju Tough-6010, mju Tough-6020 and replaces OEM LI-50B battery pack.
3.7V 800mAh lithium-ion cell delivers rated capacity for standard shooting; flash recycling and continuous autofocus pull full discharge current.
Connector slides straight into camera battery slot with single locking tab; orientation marked on cell housing and inside chamber.
Bench test showed clean BMS acceptance on first insert with Olympus charger; voltage curve tracked linear discharge through full cycle.
On first use, run one complete charge cycle through the mju 9010 body before extended shooting — the camera firmware maps battery percentage to this cell's discharge curve during initial charge.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

800mAh

Olympus mju 9010 / mju Tough Series — 3.7V Li-ion Replacement Battery (LI-50B)

This 3.7V, 800mAh Li-ion cell replaces the OEM LI-50B battery used in the Olympus mju 9010 and the mju Tough-6000, Tough-6010, and Tough-6020 series, along with 88 additional compatible models. It fits the same physical bay, uses the same contact layout, and runs at the same voltage as the factory cell. Capacity matches the original — 800mAh (2.96Wh) — no guesswork on what you're getting.

  • mju and mju Tough platform fit: These models share the LI-50B form factor — same 40.12 × 34.00 × 6.72mm envelope, same 3.7V nominal rail, and the same three-contact BMS interface. The camera body reads charge state through that interface, so the cell needs to match exactly for the indicator to function.
  • Bench tested on actual hardware: We ran this cell in an mju Tough-6010 body. The BMS accepted the cell on first insertion, reported a valid charge state, and cycled through discharge without triggering a low-voltage cutoff event earlier than expected at the 3.0V threshold.
  • First-cycle initialisation on the mju body: Insert this cell and run a full charge from within the camera body or OEM charger before shooting. Some mju BMS firmware maps the battery-remaining display to a discharge curve it calibrates on that first cycle — skipping it causes inaccurate percentage readings from the start.

Flash recycling lag on the mju Tough series with a new replacement cell

The mju Tough models fire a built-in flash that pulls a sharp current spike each time the capacitor recharges between shots. A new cell at partial state of charge — or one that hasn't completed its first full cycle — may show slower recycling because the BMS temporarily limits peak draw until it has mapped the cell's internal resistance. This isn't a fault in the cell. After two to three full charge-discharge cycles, the BMS recalibrates and flash recycling returns to normal speed. If lag persists past three cycles, check that the contacts are clean and making firm contact with the battery tray.

Battery percentage jumping erratically on the mju 9010 display

This happens when the camera's fuel gauge maps voltage thresholds to a discharge curve it calibrated on the old degraded cell, then tries to apply that same curve to a fresh replacement with a different internal resistance profile. The mismatch causes the indicator to skip levels — jumping from 80% to 40% mid-session, or reading full when the cell is at 3.85V. The fix is a full charge in the camera body, followed by a complete discharge to auto-shutoff, then a second full charge. That two-step cycle gives the BMS enough data to remap the threshold table to the new cell's actual curve.

Compatible Models

mju 9010 mju Tough-6000 mju Tough-6010 mju Tough-6020 mju Tough-8000 mju Tough-8010 SP-800 UZ SP-810 UZ SZ-20 SZ-10 SP-720UZ SZ-11 SZ-14 VR-360 VR-340 VG-170 SZ-25MR SZ-31MR Tough TG-820 Tough TG-620 Tough TG-610 SH-25MR U1010 U1020 U1030 Stylus 1010 Stylus 1030SW u9000 Tough 8000 mju 1010 mju 1020 mju 1030 sw mju 9000 Stylus 9000 Tough 6000 Tough 8010 SZ-30MR TG-810 XZ-1 VH-510 D-750 D-755 D-760 Mju 740 Mju 750 Mju 760 SH-21 SP-800UZ SP-810UZ SP-815UZ SZ-12 SZ-31MR iHS Stylus TOUGH-6000 Stylus TOUGH-8000 Stylus-9000 TG-620 TG-820 TG-820 iHS Tough TG-620 his Tough TG-810 VR-340 Kit VR-350 VR-360 Kit XZ-10 u 1010 u 1020 u 1030SW u 730 u 740 u 750 u 760 u 9000 u TOUGH-6000 u TOUGH-6010 u TOUGH-6020 u TOUGH-8000 u TOUGH-8010 u-9010 VH-520 Traveller SH-21 Traveller SH-25MR SP-800 SZ-15 SZ-16 TG-630 TG-830 TG-835 TG-850 VH-410 TG-2 LS-100 VH-5

Replaces Part Numbers

LI-50B

Technical Specifications

Voltage3.7V
Amp Hours800mAh
Capacity800mAh
Rate2.96Wh
Net Weight18g /0.63 oz
Gross Weight43g /1.52 oz
Approximate Weight43g /1.52 oz
Dimension 40.12 x 34.00 x 6.72mm

Product Highlights

  • Brand: Olympus
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Olympus mju 9010 shows "no battery" or won't recognise the new LI-50B cell — what's wrong?

The mju BMS runs an authentication check on insertion, and a new cell at low voltage can fail that check on the first attempt. Remove the battery, reinsert it firmly so all three contacts seat fully, then place it in the OEM charger for one complete charge cycle before putting it in the camera body. That single charge cycle is usually enough for the camera to accept the cell and display a valid state. If the camera still rejects it after a full charge, clean the battery contacts with a dry cloth — oxidation on the tray contacts causes the same symptom.

Shot count seems lower than expected — the LI-50B drains noticeably faster than the old battery did at first

Cold ambient temperature is the most common cause that isn't cell fault. Li-ion internal resistance rises sharply below 10°C, which reduces usable capacity per charge and makes the battery gauge drop faster than it would at room temperature. Keep the spare cell in a shirt pocket between shots and swap it in warm — you'll recover most of that apparent capacity loss. If drain is excessive at normal temperatures, confirm the LCD backlight timeout is set to the shortest available interval, as the mju 9010's display is one of the highest constant-draw loads on this 800mAh cell.

The camera body feels warm during extended video recording and the battery drops faster than during stills shooting — is that normal?

Yes — it's a draw issue, not a cell fault. During video, the mju Tough series runs the sensor, image processor, and autofocus system simultaneously without the rest periods between still frames. That combined load pulls more current than the 800mAh cell is rated for in still-capture use, and the camera body itself generates heat from the processor. Limit continuous video clips to the camera's recommended segment length and allow a short rest between clips so the cell temperature drops back below 40°C, which keeps the BMS from throttling output to protect the cell.

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