Lithium polymer is more well-known "delicate" and must multi-circuit protection, complex process, and thus higher manufacturing costs, but the value is much higher than its price! Certainly can not take compared to nickel-metal hydride batteries, because the product is not on the same platform. We focus on product quality and safety, I think this is of concern to you. Buy something, especially the battery, with the first well, durable, safety is more important. KENTLI polymer lithium battery using anti-overcharge, over discharge, short circuit, overheating, such as multiple intelligent protection circuitry to ensure the safe use of the product. And now is the popularization of the price of the product are low, please do not bargain!