26-08-2016, 01:41 PM
(This post was last modified: 26-08-2016, 02:03 PM by Paul Baldwin.)
Interesting find Sam! I remember these coming out and all the crap Sinclair got from the British press, they really went for it on that one, twats. I just found this if any use to you? http://c5alive.co.uk/oldstuff/pub/downlo...Manual.pdf Looks like the ULA chips are unreliable with age but there's a few fixes out there 
Battery Protection
The C5 battery is a flat plate semi-traction lead-acid unit developed and manufactured for
Sinclair Vehicles by Oldham batteries. The specification is as follows:
Weight: 15 Kg
Capacity at five-hour rate: 36 Ah
Depth of discharge: 80 % of five-hour capacity Cycle life: 300 for 20 % reduction in capacity To prevent over discharge, a technique incorporating a compensated terminal voltage measurement under load was used.
Circuits employed are part of a semi-custom integrated circuit and these also provide a visible indication of battery charge in the form of a five segment bar graph display.
The onset of battery cut-out is preceded by a 20 second audible warning period, in order to provide sufficient time to complete any ongoing manoeuvre and make vehicle and driver safe. A block diagram of the battery condition gauge is shown in
Figure 5
Possibly something to do with the above maybe?
.
Battery Protection
The C5 battery is a flat plate semi-traction lead-acid unit developed and manufactured for
Sinclair Vehicles by Oldham batteries. The specification is as follows:
Weight: 15 Kg
Capacity at five-hour rate: 36 Ah
Depth of discharge: 80 % of five-hour capacity Cycle life: 300 for 20 % reduction in capacity To prevent over discharge, a technique incorporating a compensated terminal voltage measurement under load was used.
Circuits employed are part of a semi-custom integrated circuit and these also provide a visible indication of battery charge in the form of a five segment bar graph display.
The onset of battery cut-out is preceded by a 20 second audible warning period, in order to provide sufficient time to complete any ongoing manoeuvre and make vehicle and driver safe. A block diagram of the battery condition gauge is shown in
Figure 5
Possibly something to do with the above maybe?
.