Quote:
Originally Posted by csb
The specs do say 4.5aH (aH = Amp hours) which means if your mount uses 1.5Amps you will get about 3hrs use before it goes flat (if it uses 4.5Amps then only 1hrs use).
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Not quite right.
The discharge rating is based by convention on a 20hr discharge period. ie a 20A/h battery can give one amp for twenty hours. 20A/h does not mean it is capable of 20 amps for one hour or even 2 amps for 10 hours.
You really do want to be conservative when calculating the amps budget and always buy bigger so as not to run your battery flat, which will shorten its life considerably.
A tip: When the unloaded voltage of an SLA battery is 12.0V you have drained very close to 50% of its capacity.