GRAPHTEC GL820 - Using the Battery Pack (B-517: Option); Mounting the Battery Pack

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CHAPTER 2 Checks and Preparation
2.9 Using the Battery Pack (B-517: Option)
● The B-517 (option) is the only battery type that can be used with the GL820.
● Refer to the specifications (P.4-7) for information on the battery run time.
● The operating temperature range of the GL820 with a battery pack mounted is as follows:
Running on battery : 0 to 40°C
Battery being charged : 15 to 35°C
Mounting the Battery Pack
(1) While lightly pushing the grip of the battery cover, slid the cover in the direction indicated by the arrow.
(2) Attach the battery pack (B-517).
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Either one or two battery packs can be attached.
To connect one pack, connect to either one of the connectors.
Attaching two battery packs allows longer operational time.
When attaching two battery packs, make sure the battery levels are equivalent.
Do not use a new battery with an old battery at the same time.
When attaching two battery packs, make sure the remaining amount are same.
If you are not sure about the amount, charge each battery and then attach full-charged two battery packs.
(3) Attach the battery cover.