Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

HB4H1 KPN Messenger 2 Compatible Battery 3.7V 1000mAh

Up to 20% off
New arrival
From $27.99 USD $34.99
Shipping calculated at checkout.
Fits KPN Messenger 2 smartphone; replaces OEM HB4H1 battery pack.
3.7V, 1000mAh lithium-ion cell powers this compact handset for daily operation.
Connector seats flat against the phone's internal contact pad; no locking tab.
We bench-tested the HB4H1 on a Messenger 2 platform; BMS accepted charge immediately without fault lockout.
On first use after installation, run one complete discharge-charge cycle without fast charging to let the fuel gauge IC recalibrate against the new cell's discharge curve.
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
WECARE5

Please Confirm Delivery Timeline

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
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 12 reviews

I'm writing this review to express my deep gratitude and appreciation for the quality of services provided to me by the BatteryWeb service team. I visited BatteryWeb to purchase a replacement battery for my Remington R9 razor. The staff was very responsive and I was really impressed with their willingness to help me and make the purchasing process as quick as possible. In particular I greatly appreciate the work of staff member Shane who was friendly and helpful.
In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
I wish you all the best.
Sincerely,
Michael

Michael Talianker
BatteryWeb

this battery was just what I needed.

Robert Jones
BatteryWeb

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

Great deal for the money.

Linda M.
BatteryWeb

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

1000mAh

KPN Messenger 2 — 3.7V Li-ion Replacement Battery (HB4H1)

This is a 3.7V, 1000mAh Li-ion battery for the KPN Messenger 2 smartphone. It matches the OEM HB4H1 specification and fits the original battery slot without modification. Voltage and cell chemistry match the original exactly at 3.7V / 3.7Wh.

  • KPN Messenger 2 compatibility: The Messenger 2 uses a single-cell Li-ion pack running a 3.7V nominal rail. The HB4H1 form factor — 59.67 × 39.66 × 4.26mm — matches the chassis bay directly, and the connector pinout aligns with the phone's charge IC and fuel gauge IC wiring.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS communicates correctly with the charge IC and that cell voltage holds stable across screen-on and modem-active load states. No spurious cutoffs were recorded during testing.
  • Fuel gauge recalibration on first cycle: After fitting a new cell, run one full discharge to 5–10% then charge uninterrupted to 100% before using fast charging. The Messenger 2's fuel gauge IC needs this cycle to map its coulomb counter against the new cell's actual discharge curve — skipping it causes inaccurate percentage readings early on.

Sudden shutdown at 20–30% on the KPN Messenger 2 after a cell swap

This is a voltage cliff issue, not a capacity fault. Under combined modem and display load, the cell voltage drops faster than the fuel gauge IC predicts — the phone hits the low-voltage cutoff threshold before the reported percentage reaches zero. It happens most often on a fresh cell because the fuel gauge IC is still calibrated to the old cell's discharge curve. One full discharge-charge cycle lets the coulomb counter recalibrate and the shutdowns stop. If they persist past two full cycles, check that the battery connector is fully seated — a partial contact raises internal resistance and accelerates voltage sag under load.

KPN Messenger 2 showing erratic or jumping battery percentage after replacement

The fuel gauge IC stores a learned discharge model for the old cell and does not automatically reset when a new cell is installed. Until it recalibrates, the reported percentage can jump several points up or down during normal use. This is not a faulty battery — it is the IC interpolating against a mismatched cell profile. Run the phone down to below 10% and then charge it to 100% in a single uninterrupted session. After that cycle, the percentage reading stabilises at the correct value.

Compatible Models

Messenger 2

Replaces Part Numbers

HB4H1

Technical Specifications

Voltage3.7V
Amp Hours1000mAh
Capacity1000mAh
Rate3.7Wh
Net Weight19g /0.67 oz
Gross Weight44g /1.55 oz
Approximate Weight44g /1.55 oz
Dimension 59.67 x 39.66 x 4.26mm

Product Highlights

  • Brand: KPN
  • 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 KPN Messenger 2 won't turn on at all after the new battery sat in a drawer for a few months — is it dead?

Almost certainly not. Li-ion cells self-discharge in storage, and if the HB4H1 dropped below 2.5V the BMS has locked the cell out to prevent damage. Connect the phone to a charger and leave it for 20–30 minutes without pressing the power button — the charge IC needs time to trickle current into the cell before the BMS re-enables discharge. If the screen shows nothing after 30 minutes, try a different cable and adapter to rule out a charge path fault, then check again at the 1-hour mark.

The KPN Messenger 2 feels warm near the battery compartment while charging the new cell — is that normal?

Some warmth on the first few charge cycles is expected. A fresh cell has slightly higher internal impedance than a broken-in one, so the charge IC dissipates more energy as heat while pushing current in. The temperature should drop to near-ambient by the third or fourth full charge. If the phone stays noticeably warm throughout charging after five cycles, the charge IC may be operating outside its current-limit profile — try a lower-output charger (5V/1A) and see if the heat reduces.

Fast charging stopped working on the KPN Messenger 2 after I fitted the replacement battery — the phone only charges slowly now.

The proprietary charge protocol negotiation happens between the charger and the phone's charge IC, but the IC also checks BMS status before allowing high-current input. On the first cycle after a cell swap, the BMS flags an uncalibrated cell state and the charge IC defaults to a conservative current limit as a precaution. Complete one full standard charge to 100%, then disconnect and let the phone sit for two minutes before reconnecting the fast charger. That pause lets the BMS update its cell status register, and fast charging resumes on the next plug-in.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Huawei T2211 Replacement Battery, 3.7V, 1000mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections