A battery as flat as Norfolk...

[Kukri]

Norfolk isn't all that flat - it even has hills and cliffs in places! Try Cambridgeshire and Lincolnshire for REALLY flat fenland!

I used to belong to the Gog Magog Hills Mountain Rescue Team! It's at least 74 metres!

 

[macd]

Thanks. I just ran out of time. The ADVERC might well have had plans to carry on, and was probably just doing a float phase before resuming its efforts, but I didn't care to leave it connected. The two starter batteries, which must also have had six months un-charged, were at 12.6 and 12.5

Obviously any active load on the system would contrubite, it's worth bearing in mind that deep-cycle batteries will self-discharge at a very much higher rate than starter batteries.

(This is not directly to do with intended function but the fact that deep cycle jobs usually have lead-antimony plates, whilst starter and many "leisure" batteries have lead-calcium. The latter can typically be left for a year from fully charged without going below 50%, a degree of neglect which could kill the former. That said, the best storage condition for either is fully-charged and maintained there. A motorcycle battery maintenance charger delivering a max 1A and usually less, isn't a bad idea, if on mains, or a small solar panel if not.)

 

[Kukri]

Obviously any active load on the system would contrubite, it's worth bearing in mind that deep-cycle batteries will self-discharge at a very much higher rate than starter batteries.

(This is not directly to do with intended function but the fact that deep cycle jobs usually have lead-antimony plates, whilst starter and many "leisure" batteries have lead-calcium. The latter can typically be left for a year from fully charged without going below 50%, a degree of neglect which could kill the former. That said, the best storage condition for either is fully-charged and maintained there. A motorcycle battery maintenance charger delivering a max 1A and usually less, isn't a bad idea, if on mains, or a small solar panel if not.)

Thanks. There being no gas on board, I pulled the fuse on the gas alarm system. I'm quite "religious" about the maintenance charge on the bike's Odyssey battery!

 

[LittleSister]

The only way of telling is an actual capacity test. There are various methods. The simplest is . . .

. . . to use them, and see if they do the job you need done.

I'm not at all knocking the more thorough and precise capacity test you described (which Minn seems happy to do), but it ain't the simplest.

 

[sailaboutvic]

Try riding a bike in snow in Norfolk you soon find out it's not flat , anyway SYH is Suffolk get it right
Good luck with the batteries if it was me , I would charge them up , remove them all And get a meter on each one , Then re check in 24 hours and see if any have drop much .
Big drop dump
But hey what do I know .

 

[capnsensible]

Does the battery have a strange third terminal? Things like that happen in Norfolk, but considered normal there......

 

[Kukri]

I must apologise for misleading people who have so kindly offered advice. The charger is not an ADVERC, it's a Sterling, model 1250CED.

 

[DownWest]

Not to worry, most of the advice did not concern the charger...

 

[LittleSister]

I must apologise for misleading people who have so kindly offered advice. The charger is not an ADVERC, it's a Sterling, model 1250CED.

No matter. It's traditional for replies to ignore both the question actually asked and the background detail provided!