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BT-L1 battery 7.2V Li-ion 3000mAh for Gowin Total Station Brand New BT-L1 battery 7.2V / 3000mAh for Gowin/Cygnus Land Surveying Total Stations Compatible with models Gowin / Cygnus TKS-202, TKS-202N, TKS-202R, TKS-402N