Synergy Digital Power Tool Battery, Compatible with Einhell PXBP-300 Power Tool, (Li-ion, 18V, 4000mAh) Ultra High Capacity, Replacement for Einhell 4511396 Battery - Walmart.com
Einhell 4511481 18-Volt 4.0-Ah Lithium-Ion Power X-Change Battery, Amp, Red - - Amazon.com