by Batteries America
$ 85.00
$ 59.95

BP-272LH: 7.4 volt 2270mAh rechargeable long-life Li-ION battery for ICOM ID-51A, ID-51A Plus, ID-31A, ID-51E, ID-31E (D-STAR; all worldwide versions). Replaces original BP-272, BP-271.
Recommended accessories: 
Wall Charger: BC-110AR
DC Power & Charge cable: CP-12L
Desktop Rapid Charger: EMS-272
AA Battery Case: BP-273

Pricing is for 1 battery.  Picture shows both sides of the battery.
Option: you can add a Spring-loaded Belt Clip for $ 6.95. It attaches to the back of the battery.