If your looking for a replacment battery for the rs-97 these are very good and last longer than the original. Ebay links below its for x2 i have one myself and has been working great in my device.
https://www.ebay.com/itm/2x-Backup-Li-ion-Phone-Battery-BL-5B-1390mAh-For-Nokia-3230-5300-5070-6121-6080/302127851617?hash=item4658392861:g:iqoAAOSw0fhXiFOY
