---
product_id: 104975529
title: "36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406"
brand: "mpf products"
price: "RM115"
currency: MYR
in_stock: true
reviews_count: 4
url: https://www.desertcart.com.my/products/104975529-36mah-battery-replacement-compatible-with-fitbit-alta-activity-tracker-smart
store_origin: MY
region: Malaysia
---

# 3.7V Lithium-Polymer tech 36mAh high-capacity power Wide Fitbit Alta FB406 compatibility 36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406

**Brand:** mpf products
**Price:** RM115
**Availability:** ✅ In Stock

## Summary

> 🔋 Stay charged, stay ahead—never miss a step!

## Quick Answers

- **What is this?** 36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406 by mpf products
- **How much does it cost?** RM115 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/products/104975529-36mah-battery-replacement-compatible-with-fitbit-alta-activity-tracker-smart)

## Best For

- mpf products enthusiasts

## Why This Product

- Trusted mpf products brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Voltage:** 3.7V Lithium-Polymer rechargeable battery for reliable, consistent performance
- • **Trusted Replacement:** MPF Products® quality ensures your fitness journey never pauses
- • **Power Up Your Fitbit:** 36mAh battery ensures extended daily tracking without missing a beat
- • **Lightweight & Compact:** Slim 3.78 x 1.61 x 1.1 inch size keeps your tracker sleek and comfortable
- • **Seamless Compatibility:** Specifically designed for Fitbit Alta FB406 models—no guesswork, just perfect fit

## Overview

This 36mAh, 3.7V Lithium-Polymer rechargeable battery is a precision replacement for Fitbit Alta FB406 models, delivering reliable power in a compact, lightweight design to keep your fitness tracker running smoothly and your health goals on track.

## Description

36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406.

## Features

- Intended for/Compatible with the Following Fitbit Wristband Watch Models: Fitbit Alta, FB406, FB406BUS, FB406BUS, FB406BKS, FB406BKL, FB406GBKS, FB406GBKL, FB406PMS, FB406PML, FB406TES, FB406TEL (PLEASE NOTE: THIS BATTERY IS NOT COMPATIBLE WITH THE FITBIT ALTA HR - FB408).
- 3.7V 36mAh 0.13Wh Lithium-Polymer Rechargeable Battery Pack.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Package Dimensions L x W x H | 3.78 x 1.61 x 1.1 inches |
| Package Weight | 0.02 Kilograms |
| Brand Name | MPF Products |
| Model Name | FB406 |
| Manufacturer | MPF Products® |
| Part Number | TP-FBT08 |

## Product Details

- **Number of Batteries:** 1 Lithium Ion batteries required.
- **Brand:** MPF Products
- **Battery Cell Composition:** Lithium Polymer
- **Battery Capacity:** 36 Milliamp Hours
- **Recommended Uses For Product:** Clock

## Images

![36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406 - Image 1](https://m.media-amazon.com/images/I/51mJ7p8mBiL.jpg)
![36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406 - Image 2](https://m.media-amazon.com/images/I/51Leet+qIPL.jpg)

## Questions & Answers

**Q: Is this compatible with alta hr?**
A: NO.  Unfortunately, it's NOT COMPATIBLE.  If you look at the end of the first bullet point in the Features and Details section for this item, it clearly states that it is NOT COMPATIBLE. 

Before reading the item specs here, I'd hoped it would work for the Alta HR because I found repair instructions for the Alta online but after taking my Alta HR apart, I discovered the internal parts are slightly different.  The Alta has 1 screw in the center and the Alta HR has 2 tiny screws on one end.  I stopped and reassembled.  

If the battery was cheaper, I'd almost be inclined to try it anyway since it's going to the trash bin anyway but I suppose I will continue my quest to find the correct battery.

**Q: what are the battery dimensions?**
A: Google search results:
Fitbit Alta Battery 
Dimensions LxWxH
0.83 x 0.4 x 0.13 inches

This looks about right. It's been a while since I replaced the battery in my wife's Fitbit which, by the way, is working great.

**Q: Can you tell me if it's compatible with the 2019 Fitbit Ace model? Link if possible?**
A: I can't answer for sure, but I did find a charging cable for the fitbit Alta which is also compatible with the FitBit ACE. The clip requires a very specific body shape. Pictures of the FitBit ACE look exactly like my wife's FitBit Alta. If I were in your situation I think the FB406 battery would be worth a try. There are great YouTube videos for FitBit Alta battery replacement. You need to be comfortable with soldering very small wires.

**Q: Anyone have an issue where the fitbit won't stay on after changing the battery? I'm having that issue right now.**
A: I had that issue and I went to a watch shop and was told to go thru fit bit themselves

## Customer Reviews

### ⭐⭐⭐⭐⭐ Was skpetical,but Installed Worked perfectly.
*by P***I on January 20, 2020*

I read many reviews of this and i admit, i was Very skeptical. I am leaving a review because i'm not sure if people know how to fix it.Scenario: I have a Fitbit Alta, must be about 4 years old. After 2.5 years the battery would not hold a charge at all. eventually it wouldn't even turn on plugged in. I tossed it to the side as it was not usable.Fast forward - January 2020 . New years resolutions: 1. Lose weight 2. Spend less.Prices of new devices are expensive, after looking around i figured it'd be worth a shot to fix my Alta for 1/10th price.I ordered the replacement kit and It showed up a few days later.First time opening the Alta, was a little tough. There are many videos of people using heat guns and such. I did not use anything but my thumb finger nail to get the screen cover lifted. Once i could put my finger nail underneath it fully i used a pry tool supplied with the kit.Taking off the screen wasn't too bad, pry evenly with the tool from the kit. There is only a piece of tape holding it on.Once the screen is lifted, there is one screw holding the board down. The kit has the screw driver for this. It a very tiny torx (and i did not have that size in my iphone/droid repair tool kit). Note: the Alta chassis has a couple brackets that hold the board on one side.I pulled out the trusty Weller soldering iron and took off the old battery. I used tweezers to pull of the double-sided sticky tape used to hold the battery in and stuck to the inside of the Alta. I put the battery in, carefully cut the wires to proper length and solder wires.I put it back together. NOTE: the screen cover needs to go back in a certain orientation. There is a pin that makes contact to the screen cover, so just line the two up (you will see a little metal contact on the screen cover).After putting the battery in it did Nothing. I plugged it in waited a few minutes. Shook it. ...Nothing. I left it plugged in for an hour or two, still nothing.In order to turn it on, i had to send a reboot sequence via the charger. Yes, there is a button on the USB end that you need to press in a sequence of 3 times. I left it plugged in and kept pressing it 3 times (within 8 seconds), like SOS in morse code. After a round of that BAM! it booted up.So i put a full charge on the battery and i can use it for about week without a recharge just like new.The image, is about 4 days of use and @ ~50%.

### ⭐⭐⭐⭐⭐ Works!
*by S***E on June 1, 2025*

Tricky to install but youtube videos helped. Works fine.

### ⭐⭐⭐⭐ Caveat Emptor: If you think you received a dead battery
*by O***M on October 22, 2022*

Read my erroneous original review below. If you are experiencing the same problem of the new battery appearing not to fully charge and the Fitbit only staying on while on the charger (as other reviews have also reported) there is a good chance you have accidentally shorted out your Fitbit while removing the old battery or installing the new one. There is a micro-fuse on the circuit board labeled "F1" that can be seen using magnification. This gets blown easily and you'll not be very successful in trying to replace it since it's soldered to the board and is so small. Your best option is to bypass the fuse by applying a bit of solder across the leads of F1. This will restore operation of the Fitbit. Be careful not to apply pressure to the leads since you may accidentally push the fuse out of the board. Also make sure the gold dot on the inside of the plastic screen cover is positioned over the microswitch when you put the Fitbit back together or else it won't power up at all. Changed my rating from 1 star to 4 taking off a point for the useless plastic prying tools that come with this. They are so weak they just bend instead of opening the Fitbit. Fortunately, I had better quality tools already. The only useful item is the T2 Torx driver that you need to remove the circuit board to access the battery. All that said, I'm back in business.------------------------------I ordered two batteries to replace the OEM battery that only lasts 1.5 days instead of the 5+ it should. For some reason they were shipped separately. When I received the first, I installed it and put on the charger. It appeared to be working and the Fitbit would cycle through screens while on the charger. Next morning battery had still not reached a full charge and the Fitbit would not wake up if removed from the charger. When put back on the charger it would reboot with a slightly lower battery level. If I tapped while on the charger and removed while the display was still active, the Fitbit would stay on and work until I let the display go to sleep, and then it would die until put back on the charger. Hopefully the second battery will be from a different lot and actually work. From the reviews, it's a bit of a coin toss if you will receive a good battery. Li-Po batteries have specific storage requirements and it's likely this manufacturer/distributor is not properly caring for their inventory. I'll update results with the second battery ASAP and will be returning one or both batteries accordingly.

## Frequently Bought Together

- MPF Products 36mAh Battery Replacement Compatible with Fitbit Alta Activity Tracker and Smart Fitness Watch FB406
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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-01-24*