This is a high-performance replacement remote control battery for the RTI T4, guaranteed to meet or exceed the OEM specifications of your original. The remote control battery is 4.38 x 2.28 x 0.458 inches with an output of 7.4 volts. The chemistry is LI-POL at mAH capacity. Manufactured by Empire Scientific, model number RLP-024-4. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.