Quote:
Originally Posted by rtfgnow
What we are planning to do for our t-shirt shooter is install a maxi block, like used back in 2008 and some years prior, backwards to connect the three batteries together. We will put fuses in to prevent any battery failure.
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If I understand you correctly there is nothing in between the individual batteries to prevent 'failure' (like the diode alan suggested). Do you me failure like thermal runaway? Failure like a dead battery (possible)? I'm not sure what you are preventing here, fuses are for overcurrent protection.
Generally though putting them in parallel is a relatively safe bet with sealed lead acid batteries so I doubt there would be any failure to begin (faster aging if anything). Don't combine a old battery with a newer battery in parallel. Make sure the batteries are from the same manufacturer (preferably new). Practice what Alan said about charge and discharge.