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Olympus LI-40B Replacement Battery 3.7V 660mAh

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From $22.99 USD $28.99
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Fits Olympus u730, FE-290, FE-350 Wide, FE-160 and 202 other models; replaces OEM LI-40B and LI-42B cells.
3.7V 660mAh output sustains photo capture and video record across Olympus compact cameras without midshoot power loss.
Flat rectangular form factor with center positive connector; slides into camera battery slot vertically with no locking tab interference.
Bench testing shows BMS acceptance on first insertion; cell voltage stabilized at 3.7V nominal within two charge cycles.
On first use, run one complete charge cycle inside the camera body before extended shooting — Olympus firmware requires internal voltage calibration to display accurate battery percentage.
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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

660mAh

Olympus u730 / FE Series — 3.7V Li-ion Replacement Battery (LI-40B)

This is a 3.7V, 660mAh Li-ion cell that replaces the Olympus LI-40B and LI-42B batteries. It fits the u730, FE-290, FE-350 Wide, FE-160, and over 200 additional Olympus compact camera bodies. Same physical footprint and connector as the original — slides into the battery compartment and locks normally.

  • u730 and FE Series compatibility: These Olympus compacts share the same battery bay dimensions, contact layout, and 3.7V power rail. The LI-40B and LI-42B are interchangeable across the range because Olympus standardised this cell format across multiple generations of their FE and µ (mju) lines.
  • Bench tested on actual hardware: We ran this cell through the u730 and FE-290 on the bench. The BMS accepted the cell on first install, the battery indicator populated correctly after one full charge cycle, and the protection circuit tripped normally at low-voltage cutoff without throwing an error state.
  • First charge procedure on Olympus compact bodies: Charge this cell inside the camera body or with the OEM Olympus charger before your first shoot. Some Olympus BMS firmware maps the battery-remaining indicator against a calibration charge cycle — skipping this step can cause the display to read full then drop suddenly.

Why the u730 battery percentage drops suddenly from 50% to empty

The u730 uses a voltage-threshold system to estimate remaining charge — it does not count coulombs. When a new cell has a slightly different discharge curve than the original Olympus cell, the camera misreads the voltage at mid-charge and maps it to the wrong percentage tier. The indicator then jumps when the voltage crosses the next threshold. Run one full charge-discharge cycle in the camera body and the indicator settles against the actual discharge curve of the new cell.

Flash not recycling fully between shots late in the charge cycle

The built-in flash on these compacts draws a concentrated burst of current to recharge the capacitor between shots. As the cell voltage drops toward the lower end of its discharge curve — typically below 3.5V — that recharge current sags, and the capacitor does not reach full charge before the next shot fires. The result is visibly weaker flash output and longer recycle time. If this appears during a shoot, switch the camera off for 30 seconds to let the cell voltage recover, then continue shooting at reduced burst pace.

Compatible Models

u730 FE-290 FE-350 Wide FE-160 u790SW FE-330 u710 Stylus 820 u850SW 850SW u700 X-795 u830 820 u760 u1200 780 Tough 770SW 750 FE-230 720SW Stylus 760 700 Stylus 750 u1050SW FE-190 u795SW FE-360 u740 FE-280 FE-350 FE-150 Zoom Stylus 1200 FE-320 FE-150 Stylus 840 840 Stylus 720SW X-790 u820 795SW FE-5500 u720 770SW u780 FE-220 740 FE-240 720 1200 Stylus 740 u725SW FE-300 FE-350 Grand Angle i1060 u750 Stylus 790SW FE-340 Camedia X-600 Stylus 830 Stylus 850SW u720SW X-800 u840 830 Stylus 710 Digital X-785 u770SW 790SW Tough 725SW 760 Stylus 780 Stylus 770SW 730 FE-250 710 FE-220D Stylus 730 u1040 FE-20 FE-3000 FE-3010 FE-4000 FE-4010 FE-5010 FE-5020 X-560WP Stylus 7010 Stylus 1040 Stylus 550WP Stylus 7000 Stylus 1050SW FE-4030 X-560 DM-3 DM-5 _x000D_ IR-300 _x000D_ SP-700 _x000D_ TG-310 TG-320 VH-210 _x000D_ VR-310 VR-320 _x000D_ VR-325 _x000D_ VR-330 D-720 D-725 D-730 FE-4050 FE-5000 FE-5030 FE-5035 FE-5050 Stylus 5010 Stylus 7030 Stylus 7040 Stylus 720 SW Stylus 770 SW Stylus 850 SW u 1040 u 1050 SW u 1060 u 1200 u 5000 u 700 u 7000 u 7010 u 710 u 720 u 720SW u 730 u 740 u 750 u 760 u 770SW u 780 u 790SW u 795SW u 820 u 830 u 840 u 850SW u Tough 3000 u5010 u550WP u7020 u7030 u7040 u7050 X-915 X-920 X-935 X-960 X-970 SP-700 IR-300 TG-310 VR-310 VR-325 VR-330 VR310 VR320 VR325 VR330 D-630 Zoom mju Tough 3000 mju 700 mju 720SW mju 725SW mju 730 mju 740 mju 750 mju 760 mju 770sw mju 780 mju 790sw mju 820 mju 830 mju 840 mju 850sw mju 1040 mju 1050sw mju 1060 mju 1200 mju 5000 mju 5010 mju 7000 mju 7010 mju 7020 mju 7030 mju 7040 X-15 X-845 X-855 X-600 X-750 X-825 X-835 X-875 X-905 DS-7000 DS-3500 DS-2500 DS7000 DS3500 DS2500

Replaces Part Numbers

LI-40B LI-42B

Technical Specifications

Voltage3.7V
Amp Hours660mAh
Capacity660mAh
Rate2.44Wh
Net Weight15g /0.53 oz
Gross Weight36.5g /1.29 oz
Approximate Weight36.5g /1.29 oz
Dimension 40.00 x 31.10 x 5.90mm

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 u730 shows a dead battery icon immediately after inserting a fully charged replacement LI-40B — why?

The u730 BMS runs a voltage handshake on insertion. If the cell has been sitting uncharged in a drawer, its resting voltage may have drifted low enough to trigger the dead-battery threshold even though the cell is not depleted. Place the battery in the camera or OEM charger and run a full charge to 4.2V — the camera will accept it normally after that cycle.

The shot count on my u730 is far lower than I expected with the new battery — is something wrong?

Shot count specs are measured under controlled conditions without flash. On the u730, enabling flash on every shot, using the optical zoom repeatedly, and leaving the LCD on full brightness all add significant current draw well beyond the baseline test. Nothing is wrong with the cell — reduce flash use to auto mode and lower LCD brightness one step, and the count per charge will increase noticeably.

The battery percentage on my Olympus FE-290 jumps around erratically — it read 80%, then jumped to 15% without warning.

This is a voltage-threshold calibration mismatch between the new cell's discharge curve and what the FE-290 firmware expects from the original Olympus cell. The indicator is reading real voltage, but mapping it incorrectly. Run one complete charge from flat to full inside the camera body — the firmware recalibrates its threshold mapping against the actual cell, and the display stabilises from that point.

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