EEMB 4PACK Lithium Polymer Battery 3.7V 2000mAh 103454 Lipo Rechargeable Battery Pack with Wire JST Connector for Speaker and Wireless Device- Confirm

The rechargeable LiPo batteries have generated a mixed reception among customers who have used them as replacements for various devices including Bluetooth speakers, Arduino boards, and handheld radios. A key highlight is that these batteries are praised for their compatibility with specific devices, such as the dknight MagicBox II Bluetooth speaker, and even come with a slightly higher mA-hr capacity, providing extra power compared to standard options. However, potential buyers should be cautioned about the important issue of connector polarity; the battery connections are not standardized, which means that users often need to reverse the polarity before installation. This requires a certain level of technical skill and can lead to complications if not handled properly. A significant concern noted by multiple users is the swelling of the batteries. Reports indicate that several batteries have expanded Considerably during the first few charging cycles, indicating possible issues with quality or manufacturing. This has raised alarms about their safety and reliability, leading some customers to decide against repurchasing this brand after experiencing performance issues. Additionally, users reported failures in charging and functionality in various devices, which further adds to the dissatisfaction. In summary, while these batteries offer good capacity and compatibility, issues with polarity, swelling, and overall reliability diminish their appeal. Customers looking for a straightforward, hassle-free battery replacement may want to Consider alternative options. **