2000mAh Lithium battery for SL1, SP2, SP2-Warm & New Version of SP1,SP1-Warm (Sold after Jul. 1st, 2014) 3.7v 2000mAh, including protection board For SL1, SP2, SP2-Warm & New Version of SP1,SP1-Warm (Sold after Jul. 1st, 2014)