I've used a small 12v 7ah battery to fire up my LX90 for the last 4 years and it works fine. I have another battery (18ah) for the corrector heater but the little 7ah works wonders for hours.
BUT! Be very careful with polarity! I was unaware that I had crossed polarity on the scope battery after charging it once and it fried the LX90! Bintel supplied the part and instructions on how to fit it and with the help of a mate I was able to do this. The alternative was to send it to Bintel from NW Tasmania at my cost and a repair cost of $100.
I don't know if Celestron have the same wiring circuit but be very careful just in case! A battery of that size seems like a bit of overkill to me and I love the portability of the little 7ah battery with carry case. I also had a cigarette lighter connection from the spade connectors to the battery.
Polarity doesn't matter on the larger one for the heater.
Good luck!
Cheers!
Popeye
