Canon Speedlite EL-100 User Manual page 13

CAUTION
Do not use "AA/R6 lithium batteries".
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Note that certain AA/R6 lithium batteries may become extremely hot in
rare cases during use. Due to safety reasons, do not use "AA/R6 lithium
batteries".
Do not use the Speedlite while touching the same part for a long
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period of time.
Even if the product does not feel too hot, prolonged contact with the same
body part may cause skin redness or blistering due to low-temperature
contact burns. Using a tripod is recommended in very hot places or for
people with circulation problems or less sensitive skin.
Using AA/R6 batteries other than the alkaline type may cause contact
failure due to the irregular shape of the battery contacts.
Use a new set of two batteries of the same brand. When replacing the
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batteries, replace both at the same time.
AA/HR6 Ni-MH batteries can also be used.
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For details on the flash interval and flash count, refer to the separate
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Supplemental Information.
Installing the Batteries
13