40mAh Battery Replacement Compatible with Fitbit Alta HR Smart Activity Tracker and Fitness Watch FB408

The 40mAh Battery Replacement for the Fitbit Alta HR has garnered a mixed reception from customers. Several users have found that while the replacement battery is indeed compatible, it presents some challenges during installation. A common theme among user experiences is that the battery is slightly larger and thicker than the original, which necessitates careful handling during installation. Customers have noted the importance of ensuring the battery terminals are positioned correctly, as incorrect placement can affect performance. Some reviewers expressed satisfaction with their decision to replace the battery instead of the entire device, emphasizing the cost-effectiveness of such a choice. However, not all experiences were positive. A significant concern was the need for soldering the connections to the Fitbit's board, with some users being unprepared for this requirement, which ultimately hindered the installation process entirely. Despite some initial success in charging, several users reported that the battery did not hold a charge after unplugging, rendering it ineffective. Issues of size and the delicate nature of the device have led to further dissatisfaction, with at least one customer experiencing a cracked screen during installation. Overall, while the product presents an affordable alternative to purchasing a new device, the complexities involved with installation and the potential for malfunction have left many customers frustrated. **