Upgrade to 16V supply
I'd strongly suggest getting a computer step-up transformer 12V-16V for the HEQ mounting. They are usually selectable voltage output. I use 16V for the HEQ and up to 18V for the LX200.
I got mine from Jaycar and modified the output socket to a standard car socket; driven from a 12V 20Ah rechargeable gives 100% performance every time
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