ACT Meters GOLD-PLUS 6V/12V Battery Tester - Manual (Page 11)

Operating Instructions
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11
2. Check the Voltage
To avoid potential battery failure problems, it is essential
to check the voltage level in new batteries to ensure that
before leaving the factory. Any battery with less than
12.30VDC should be returned to your supplier as suspect. A
new, out of the box battery should show above 12.60VDC.
3. Constant Voltage
In order for SLA batteries to charge up fully, it should be charged
at a constant voltage of between 13.2VDC (min) and 14.4VDC
(max). Optimum charging voltage is normally 13.8VDC. Time
taken to fully charge will vary depending on the Ah size of the
battery and the level of current available from the charger.
4. Batteries Hate Heat
For maximum life and performance, an SLA battery should be
or lower temperatures the Ah capacity available could vary up to
50%. Be aware that SLA batteries hate heat, the hotter the battery
the shorter its life.