Price - Rs 450.00 This Lithium-ion battery comes with a protection circuit which provides over-voltage and under voltage protection. This battery is suitable for Fetal Dopple ADB51B. Polymer lithium ion battery is a very slim, extremely light weight batteries based on the new polymer lithium ion chemistry. This is the highest energy density currently in production. Each cell outputs a nominal 3.7v at 2000mAh. Do not attempt to charge these with anything but a specialized lithium polymer charger.