Spectra, Trimble Total Stations Battery - Cross to 79400, 99511-30BBM supplies the UPGRADED CS TRS800XL Battery as a cross to the Trimble S3, S5, S7 and S8 Total Station Battery (and more, see below). Delivering 11. 1V 6800mAh of power, is also supports the Spectra Focus 35 and is a direct cross to the Trimble 79400 Battery and the Trimble 99511 30 Battery. This Aftermarket Battery uses ONLY the highest quality Panasonic cells. FITS TRIMBLE TOTAL STATIONS MODEL: S3 Total Station S5 Total Station S6 Total Station S7