Because the lithium battery needs to be connected to the protection board, the circuit is more complicated. Please ensure that you can complete the self-installation. After the delivery, you can't accept the refund. Please do not accept the refund before purchasing. Please think carefully before buying! Battery pack for self-installation  Voltage: 10.8 Volt  Capacity: freely selectable!  System: Li-Ion  made up of: 3 cells [approx. 18x65mm per cell] suitable for: Einhell Battery Pack 45.113.01, 1101 
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