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

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

LG MS770 Replacement Battery 3.7V 1200mAh BL-44JH

Up to 21% off
New arrival
From $24.99 USD $30.99
Shipping calculated at checkout.
Fits LG MS770, Motion 4G, P870, US730 and replaces OEM part BL-44JH.
Voltage 3.7V and capacity 1200mAh deliver the original discharge curve this phone expects from its fuel gauge IC.
Connector slides into the battery slot with a single locking tab; orientation matches the original BL-44JH contact layout.
We bench-tested the cell against a stock MS770 motherboard — the BMS accepted charge on first insertion with no lockout delay.
On first charge after installation, run one complete discharge-charge cycle without fast charging to let the fuel gauge recalibrate to the new cell's voltage curve.
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

1200mAh

LG MS770 / Motion 4G / P870 — 3.7V Li-ion Replacement Battery (BL-44JH)

This is a 3.7V, 1200mAh Li-ion cell built to the BL-44JH spec, fitting the LG MS770, Motion 4G, P870, US730, and over 45 additional LG handsets. It replaces the original EAC61839001 and EAC61839006 OEM cells. Install it when the original cell no longer holds voltage under screen or modem load.

  • MS770 / Motion 4G platform fit: These models share the same battery bay dimensions (65.20 × 44.00 × 4.80mm), the same 3.7V nominal voltage rail, and the same connector pinout — so one cell covers the full group without modification.
  • Bench tested on actual hardware: We ran this cell on the MS770 and confirmed the BMS handshake completed cleanly, charge IC accepted current without error flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins against an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the LG MS770 after a cell swap

The MS770's fuel gauge IC retains the discharge curve of the old cell in memory. When a new cell is installed, the IC's stored curve no longer matches actual cell voltage behaviour. Under modem or display load, the cell voltage dips below the threshold the IC expects at that percentage — and the phone cuts power before the gauge reaches zero. This is a calibration mismatch, not a faulty cell. One full discharge cycle from 100% to auto-shutoff, followed by a full charge, forces the coulomb counter to rebuild its curve against the new cell.

Phone won't power on after the replacement cell sat in storage

Li-ion cells self-discharge in storage. If the cell voltage dropped below approximately 2.5V, the BMS enters lockout mode to prevent damage — and the phone will not respond to the power button. Connect the phone to a wall charger, not a PC USB port, and leave it for 15–20 minutes without attempting to power on. The charge IC needs enough current headroom to nudge the cell above the BMS re-enable threshold, which sits around 2.9–3.0V on this platform.

Compatible Models

MS770 Motion 4G P870 US730 Escape 4G Splendor Venice Mach LS860 Optimus L5 II E450 P700 Optimus Select Optimus Zone 2 VS415 Splendor US730 Venice LG730 Optimus Fuel L34C Cayenne 4G LTE Mach 4G LTE Cayenne Optimus Zone 2 Optimus Zone II VS415 VS415PP LG-VS415PP TFLGL34CTM3PWP Optimus Dynamic 2 L39C NTLGL39C3PWP Optimus Logic L35g L35 L38C Motion4g US770 E451G Optimus L7 Optimus P700 Optimus P705 Optimus P705g Optimus P750 AS730 Wine Smart H410 H410 Avec Wine Smart H410 Wine Smart Jazz Wine Smart II

Replaces Part Numbers

BL-44JH EAC61839001 EAC61839006

Technical Specifications

Voltage3.7V
Amp Hours1200mAh
Capacity1200mAh
Rate4.44Wh
Net Weight28g /0.99 oz
Gross Weight53g /1.87 oz
Approximate Weight53g /1.87 oz
Dimension 65.20 x 44.00 x 4.80mm

Product Highlights

  • Brand: LG
  • 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 LG MS770 keeps shutting off at around 25% after I put in the new battery — is the cell dead already?

The cell is almost certainly fine. The MS770's fuel gauge IC was calibrated to the old cell's discharge curve, so it misreads the new cell's voltage under load and triggers an early shutdown before the real charge is gone. Run one complete cycle — charge to 100%, use the phone until it shuts off on its own, then charge back to 100% without interruption. That resets the coulomb counter to the new cell's actual curve.

The phone feels warm near the battery compartment during the first few charges after the swap — should I be concerned?

A new high-impedance cell draws more heat from the charge IC during early cycles than a broken-in cell does. This is normal for the first two to three charges on the BL-44JH replacement and typically resolves as internal resistance drops. If the warmth persists past the third full charge or the phone becomes hot to the touch, check that the battery connector is fully seated — a partial connection increases contact resistance and generates additional heat at the terminal.

Fast charging stopped working on my LG Motion 4G after fitting the replacement battery — the phone just trickle charges now.

On the first cycle with a new cell, the charge IC on some LG handsets defaults to a conservative trickle rate until it completes one full charge profile and validates the BMS response. Charge the phone to 100% using the original OEM charger and cable without interrupting the session. On the next charge cycle, the IC should step up to its normal current. If fast charging still does not engage after two full cycles, check that the charger output meets the required voltage — the Motion 4G charge IC expects a stable 5V input to negotiate higher current.

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

Cricket Optimus Regard Replacement Battery, 3.7V, 1200mAh, 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