10.5v?

[treerat]

Hi all

A question to which I think I knowthe answer

When I brought the rib home the battery was dead flat. I charged it for 48 hrs and then put a voltage tester accross it. It only read 10.5v.

The charger was charging at 15v and if I put the tester accross then disconected the chager the volts just dropped away. It has been constant at 10.5v for about 5 hours.

Is it possible that the Mariner 40 only needs a 10.5v battery and that is what is fitted or is it, as I suspect, of no use and should be a 12v one. There is no voltage printed on it only an amperage.

Andy

[PeterM]

I would politely suggest its screwed & you need a new battery . All the batteries ( of this type ) I've ever had have at least 12.5 v charged with no load irrespective of AH

[doggypaddle]

Originally Posted by Blackroady

I would politely suggest its screwed & you need a new battery . All the batteries ( of this type ) I've ever had have at least 12.5 v charged with no load irrespective of AH

Inline.
Lead acid battery 6 cells nominally 2 volts each 2.2 fully charged.
10.5 volts = one dead cell
You need to spend some rubels on a new battery.

[jyasaki]

Definitely a toasted battery.

Should read over 12V at rest (even if somewhat discharged.) 12.2 to about 12.6 is normal.

BTW, 15V is a little heavy for a charging voltage; should be more in the 14.0 to 14.6 range. Perhaps a new charger should be on the shopping list as well.

jky

[doggypaddle]

Originally Posted by jyasaki

Definitely a toasted battery.

Should read over 12V at rest (even if somewhat discharged.) 12.2 to about 12.6 is normal.

BTW, 15V is a little heavy for a charging voltage; should be more in the 14.0 to 14.6 range. Perhaps a new charger should be on the shopping list as well.

jky

15 volts is fine for a charger, but as jky says it would be too high to leave on continuous charge, newer calcium batteries tend to need a bit more than 14.6 volts 14.8-15 is fine, bear in mind we dont know what current the battery was drawing at 15 volts, i would guess not much with a dead cell so the voltage would be a little high. chargers tend not to have smoothing capacitors or regulators so open circuit voltage readings with a DC meter are a bit inaccurate anyway.

[Nektarios]

this may help to understand the approximate charge.

Digital Voltmeter Open Circuit Voltage Approximate State-of-Charge
12.65 100%
12.45 75%
12.24 50%
12.06 25%
11.89 Discharged