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Navman F15 GPS Compatible Battery 3.7V 750mAh T300

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Fits Navman F15 and S45 GPS navigators, replaces OEM part number T300.
3.7V lithium-ion cell rated 750mAh delivers 2.78Wh to sustain navigation operation on active route guidance.
Single-cell form factor measures 50.18 x 36.39 x 5.35mm; connector type and locking tab match OEM slot exactly.
We bench-tested the T300 across charge cycles; BMS accepted initial charge at 0.5C without fault codes, held voltage stable under load.
After fitting this cell, power the F15 fully on outdoors and allow five to ten minutes for cold-start satellite acquisition before navigation use.
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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.

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⚠️ 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

750mAh

Navman F15 / S45 — 3.7V Li-ion Replacement Battery (T300)

This is a 3.7V, 750mAh Li-ion replacement battery for the Navman F15 and S45 portable GPS navigators. It slots in where the original T300 cell sits and restores power to the device. Use this when the original battery no longer holds charge or causes unexpected shutdowns during navigation.

  • F15 and S45 compatibility: Both the F15 and S45 share the same T300 battery footprint, voltage rail, and connector pinout. The BMS handshake on each device expects a 3.7V nominal cell — this replacement meets that spec without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the F15 platform. The BMS accepted the cell immediately, completed a full charge cycle without fault, and drew down to the low-voltage cutoff without triggering a protection trip.
  • First satellite fix after battery swap: After fitting this cell, power the unit on outdoors before your first drive. The GPS performs a cold start after any full power removal — first satellite acquisition takes 5–10 minutes. Subsequent warm starts return to under a minute once almanac data is cached.

GPS accuracy dropping at low battery on the F15

The F15 reduces receiver sensitivity as cell voltage drops toward the 3.2V threshold. This is a firmware-level power-saving measure, not a hardware fault. Position scatter and slower route recalculation both appear before the device shuts off. Keeping the battery above 3.5V during active navigation prevents the sensitivity reduction from engaging.

Device shuts off without a low-battery warning on the F15

After fitting a new cell, the fuel gauge on the F15 is uncalibrated against the new battery's discharge curve. The device's voltage-threshold indicator can hit the hardware cutoff before the on-screen warning fires. This resolves after one full charge-and-discharge cycle, which re-anchors the gauge to the actual cutoff point. Complete one full cycle — charge to 100%, run through active navigation until the device powers off — to calibrate.

Compatible Models

F15 S45

Replaces Part Numbers

T300

Technical Specifications

Voltage3.7V
Amp Hours750mAh
Capacity750mAh
Rate2.78Wh
Net Weight20g /0.71 oz
Gross Weight45g /1.59 oz
Approximate Weight45g /1.59 oz
Dimension 50.18 x 36.39 x 5.35mm

Product Highlights

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

Frequently Asked Questions

My Navman F15 lost all my saved routes after I swapped the battery — is that normal?

Yes. The F15 stores some route and POI data in battery-backed volatile RAM. A full power removal — which happens during a battery swap — clears that memory. Data saved to the internal flash (favourites saved through the menu, not just recent destinations) typically survives. Re-enter any routes that were held only in active memory, and save them explicitly to favourites before your next swap.

Satellite lock is taking 5–10 minutes on my F15 after fitting the new battery — something wrong?

Nothing is wrong. Removing the battery causes a full cold start — the device loses its cached almanac and ephemeris data, so it has to re-download satellite position data from scratch. That takes 5–10 minutes with a clear sky view. Stand outside with the unit powered on before you drive. Once the almanac re-caches, warm starts drop back under a minute.

My F15 is draining the new battery much faster during active turn-by-turn navigation than it did on standby — why?

Active navigation runs the GPS receiver and the display simultaneously at sustained load, which draws significantly more current than standby. Screen brightness is the biggest variable — reducing brightness to mid-level cuts display current draw noticeably. Route recalculation also spikes receiver load each time the GPS searches for signal. Lower brightness to 50% and verify the screen timeout is enabled for the highest impact on battery draw.

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