Acroprint TQ600 (software version 4.x and above) - Manual (Page 56)

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Connection
Note: Connect the Mini-UPS to the TQ600 first, then plug the UPS
in and turn the power on.
Battery Storage:
Store batteries in a cool/dry place 50-86º F (10-30 º C). DO NOT store
batteries for over 3 months and do not store them in direct sunlight, high
temperature or high humidity. Charge the batteries at least once
every three months in order to maintain 50% of the rated capacity of
the battery. Keep the batteries away from chemicals and heat sources.
Warning:
Batteries may leak, overheat, catch fire or explode if you don’t follow
proper safety & handling:
z DO NOT get batteries wet
z DO NOT place batteries near heat sources
z DO NOT use any charger other than the original charger
z DO NOT inverse polarity connection
z NEVER throw batteries into fire. Properly dispose of
batteries according to local rules and regulations.
z DO NOT allow anything to short circuit the batteries (connect
the positive and negative terminals of the battery)
z Dropping a battery may damage the battery. Replace
the battery if you suspect that it is damaged.