SOHC.co.uk Forums > CB750
Battery oximiser
McCabe-Thiele (Ted):
As far as I know topping up will not make any differance.
If the battery is subject to prolonged overcharging you could loose some of the Electrolyte.
IIRC the killer for batteries is letting them go too flat/Sulphination over time.
When I was in the car trade brand new cars in the showroom would have batteries go flat leading to early failure within a few weeks or months. Most manufacturers will not cover this under the new car warranty unless it's caused by failure due to a manufacturing fault.
Maintaing the battery voltage is where Smart Chargers really help as they have a Pulse Charge system built in to top up the charge - activated when the terminal voltage falls below a certain limit.
Pauarc:
Thanks for the advice and help
K2-K6:
--- Quote from: Pauarc on March 07, 2024, 11:59:59 AM ---If you have to top up battery does that shorten the battery life my bat is only a year old and I had to top it up yesterday with distilled water they were just above the minimum
--- End quote ---
No, not normally. But does indicate that it's been charging a little above voltage needed as this will evaporate the water, hence the need to add some, also to keep the specific gravity in range.
The old Honda manuals have a decent section to describe this balance, obviously for plain lead acid type battery originally fitted.
Pauarc:
What voltage would you expect when battery is charged and not connected I have 12.5 is this okay
K2-K6:
If they generally float above 12.1 and not keep going down over reasonable period of rest, then that indicates decent range.
12.6 ~ 12.9 would likely be registered with a new battery with good charge, these numbers for conventional type as being typical.
If your one registers 12.5 and stays there with no use, then all appears OK.
You can watch them with digital meter when cranking too, and can go down to 10.8~6 even for healthy battery when under load. Much under that and you'll also hear it turning slowly.
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