Topcon RL-100 2S - Power Source Management; Instrument Battery Replacement; Rechargeable Battery Installation

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Maintaining Power Sources
How to Change Batteries on the Instrument
Dry battery
How to replace dry batteries
1 Remove the battery cover by turning the battery
cover knob to “OPEN”.
2 Remove the old batteries and replace with new
batteries (four D batteries) matching [+] and [-] as
shown in the figure.
3 Replace the battery cover and turn the knob to
“LOCK”.
Replace all 4 batteries with new ones.
Do not mix old batteries and new ones.