This is a perfect companion to an outfit such as Orion's StarMax 127 mm. EQ; 4.5 Ah, 12 Volt sealed lead/acid battery and switchable 6/12 volt charger. Battery is 3-1/2" x 2-3/4" x 4" H and weighs 4 lbs. Battery and charger have seen very little use and are in like new condition. $35.00 plus shipping.