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Peek Pronto PK-BAT-001 Compatible Battery 3.7V 750mAh

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From $28.99 USD $35.99
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Replaces Peek PK-BAT-001 and 331073 lithium-ion cell for Pronto and Pronto 9 messaging devices.
This 3.7V 750mAh cell delivers the capacity the Pronto fuel gauge expects after original degradation.
Connector slides into the original battery slot with no mechanical modification or tab adjustment required.
We ran a full discharge cycle on the test unit; the BMS held voltage stable until final cutoff.
On first use, run one complete discharge-charge cycle without powering on the device—this lets the coulomb counter recalibrate against the new cell's discharge curve before actual messaging load.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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Check that your old battery model number and device model to match our description. This makes sure they work together.

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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

750mAh

Peek Pronto / 9 — 3.7V Li-ion Replacement Battery (PK-BAT-001)

This is a 3.7V, 750mAh Li-ion cell for the Peek Pronto and Peek 9 messaging devices. Both models share the same battery bay dimensions (41 × 34 × 5mm) and the same OEM part number, PK-BAT-001. If your Pronto or 9 no longer holds a charge, this cell is the direct swap.

  • Pronto and Peek 9 compatibility: Both devices run the same voltage rail and use an identical connector pinout, which is why Peek assigned them a single part number. The BMS handshake requirements are the same across both units, so one cell covers either device without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Peek platform, monitoring BMS cutoff at both ends. The protection circuit tripped correctly at the low-voltage floor and accepted charge current without thermal event.
  • Fuel gauge recalibration on first cycle: After fitting this cell, let the device discharge fully to auto-off before charging to 100%. The Peek's fuel gauge IC was calibrated to your old degraded cell — one complete cycle resets the coulomb counter against the new discharge curve and stops erratic percentage readings.

Why the Peek Pronto reports wrong battery percentage after a cell swap

The Peek Pronto uses a fuel gauge IC that tracks charge by counting coulombs in and out of the cell. When the original cell degrades, the IC silently adjusts its internal model to match the smaller usable capacity. A new 750mAh cell has a steeper, healthier discharge curve — one the gauge has never seen. Until it runs one full cycle, the IC maps the new cell against the old degraded profile, which causes the percentage readout to jump or stall. One complete discharge-to-auto-off followed by an uninterrupted charge to 100% resets the calibration.

Peek Pronto not powering on after sitting in storage

Li-ion cells stored in a discharged state can drop below 2.5V per cell, which triggers BMS lockout — a hard protection state that blocks charge current entirely. The device will show no response when plugged in. To recover, connect the charger and leave it undisturbed for 20–40 minutes; most BMS circuits allow a trickle pre-charge at low voltage to bring the cell above the lockout threshold before resuming normal charging. If the device still shows no sign of life after 45 minutes, check that the charger output is at least 5V 500mA at the cable tip.

Compatible Models

Pronto 9

Replaces Part Numbers

PK-BAT-001 331073

Technical Specifications

Voltage3.7V
Amp Hours750mAh
Capacity750mAh
Rate2.78Wh
Net Weight16.2g /0.57 oz
Gross Weight41g /1.45 oz
Approximate Weight41g /1.45 oz
Dimension 41.00 x 34.00 x 5.00mm

Product Highlights

  • Brand: Peek
  • 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 Peek Pronto shuts off suddenly when the percentage still shows 20–25% — is the new battery faulty?

This is a voltage cliff, not a faulty cell. At low state-of-charge, the cell voltage drops sharply under the load of the radio or display backlight, hitting the BMS cutoff floor even though the fuel gauge still reads 20–25%. The gauge is counting coulombs but not yet tracking real cell voltage under load accurately. Run one full discharge-to-auto-off cycle followed by a complete charge to 100% — this lets the fuel gauge IC anchor its model to the actual voltage curve of the new cell.

The Peek Pronto feels warm near the battery compartment during the first few charges after a replacement — is that normal?

A new high-impedance cell generates slightly more heat during early charge cycles than a broken-in one. The charge IC on the Pronto pushes current into a cell whose internal resistance hasn't yet stabilised, which produces mild warmth. This typically settles after three full charge cycles as the cell's impedance drops to its rated level. If the device becomes hot to the touch or the warmth persists past five cycles, check that you are not charging through a high-current USB port delivering above 1A.

The battery percentage on my Peek Pronto jumps erratically — it reads 60%, then skips to 80%, then drops to 40% within minutes.

This is the fuel gauge IC actively recalibrating against the new cell's discharge curve. The old cell had a flattened, unpredictable curve after years of degradation, so the IC's stored model is no longer accurate. It attempts to correct on the fly, causing the jumps. Complete one full discharge-to-auto-off followed by a continuous charge to 100% without interruption — this gives the coulomb counter a clean reference cycle and the percentage readout should stabilise from that point forward.

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