Amazon.com: XSP 750mAh2 Replacement Battery for Siemens Gigaset SL1, Gigaset SL56, Gigaset SL370, SL37H, SL74 Part NO EBA-510 L36145-K1310-X401 L36880-N5601-A100 S30852-D1752-X1 V30145-K1310-X250 Parts Battery : Electronics
Siemens GIGASET 4200 Cordless Phone Battery Replacement for 4 AA NiMH 2800mAh Rechargeable Batteries - Newegg.com
Synergy Digital Cordless Phone Battery, Works with Siemens Gigaset A120 Cordless Phone, (Ni-MH, 2.4V, 650 mAh) Ultra High Capacity, Compatible with GP 55AAAHR28MX Battery - Walmart.com