Hitachi CL 14 DSL [14/34] 3 suggestions and precautions for the efficient use of the charger

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7-3. Suggestions and Precautions for the Efficient Use of the Charger
(1) Batteries may not be rechargeable immediately after use
If the storage batteries are exposed to direct sunshine for an extended period, or if the
temperature of the batteries is 40°C (104°F) or higher immediately after they have been
used in the tool, the pilot lamp may not light up when the batteries are connected to the
Model UC 18YRSL charger. This is because the built-in thermostat functions to stop the
charging when the temperature of the storage batteries reach 40°C (104°F) or more. In
such a case, the customer should be advised to place the batteries in a shaded area
with a good airflow, and allow sufficient cooling before recharging.
This phenomenon is common to all existing batteries which employ temperature
sensitive overcharge devices. The cooling time required before charging can be
accomplished varies from a few minutes to about 30 minutes, depending on the load,
duration of use, and ambient temperature.

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