Use the rotary dial to choose "Li-ion Balance Charge." Set current to 1.5A (safe for a 5Ah pack). Set termination voltage to 21.0V (4.2V per cell). Enable "Cell Logging."
The UBRT2300 occupies a sweet spot: more powerful than an Opus, easier to use than an iCharger, and uniquely capable of BMS-level communication for modern "smart" batteries. Here is where the UBRT2300 universal battery repair tools truly shines. Many modern laptop and tool batteries use a BMS with a "permanent failure" latch. If the BMS detects an undervoltage condition (even once), it blows an electronic fuse or sets a status bit that permanently disables the battery. ubrt2300 universal battery repair tools
Press Start. The UBRT2300 begins charging. When Cell 5 reaches 4.2V, the tool does not stop. Instead, it drains Cell 5 by 50mA while continuing to charge Cell 1. Over 4 hours, all cells converge to 4.18V-4.20V. Use the rotary dial to choose "Li-ion Balance Charge
9.5/10. Essential for repair pros; highly recommended for advanced hobbyists. Have you used the UBRT2300 to revive a "dead" battery? Share your story in the comments below. For more guides on battery repair and tool reviews, subscribe to our newsletter. Here is where the UBRT2300 universal battery repair