There are some things you might want to sort out on your new purchase over the next few months , certainly before you put it into use ;
Brake cables - really essential and worth the small cost of replacement for peace of mind.
Drive Belt - if it is the original then the rubber might be perished , could be worth replacing before belt slip
Gearbox - if it hasn't been recently serviced then a good greasing of the cogs is always a good idea.
Not wanting to scare you, I'm just a firm believer in prevention is better than cure
The original battery charger should show a red light whilst charging and a green light when complete, with a full charge taking about 8hrs. These chargers are very old now and I wouldn't leave one plugged in unattended.
My advice would be to fit one of our wiring kits and keep the original keyswitch in a box . Our kits are really easy to fit and open up the choice of battery you can use, plus you feel good having rewired your c5 all by yourself
. Due to their age, I find the Sinclair keyswitch assembly a little temperamental and unreliable. Since our wiring kit is "plug and play" ,with no permanent alterations, it also means if ever you come to sell it you then have the option of transferring it back to original and selling off the wiring kit. Just a suggestion
It does sound like you have bagged yourself a real bargain , well done mate