https://battery-top.com/product/new-battery-for-topcon-bt-31q-dl501-dl502-sl90282-1/
New battery for TOPCON BT-31Q,DL501 DL502 - battery-top.com
Mar 20, 2026 - Battery Information: Battery Voltage: 7.2V Battery Capacity: 1700mAh Battery Type: Ni-MH Condition: new Warranty: one year
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