Flat Battery

suzublu · 25th August 2018, 12:19

Went to move the green one this am so I could get blingy out ready for mot pre-checking and...............Click

Flat battery

Now when I bought it, the family said it kept going flat(obviously never used much) so they bought a new one, but this also kept going flat. On checking the battery, it's the wrong one

Not nearly big enough for our cars

Had a look at ECP & they've got a sale on, Bosch S4 075 with 4 year guarantee, was £117.99, now, delivered, £66.84

Result

VVC-Geeza · 25th August 2018, 16:28

ECP prices are excellent with their discount codes applied Ronnie.I have recently replaced the batteries on both the 75 and 45 with Exide one's from them,each have a four year guarantee.Can't fault them.

macafee2 · 25th August 2018, 19:24

is the size of the battery the reason its flat?
from your description I would be looking for something else. if the battery was fully charged would it start the car? if fully charged and it still has not the guts to turn the engine over and start it fair enough but flat.... what is the cause?

macafee2

suzublu · 25th August 2018, 19:59

Quote:

Originally Posted by macafee2

is the size of the battery the reason its flat?
from your description I would be looking for something else. if the battery was fully charged would it start the car? if fully charged and it still has not the guts to turn the engine over and start it fair enough but flat.... what is the cause?

macafee2

Ian, on checking the battery fitted, the specs are too low for our cars, which need a strong amperage for starting & running all the leccy bits. The old chaps family bought a cheap battery so they could sell it, not knowing what type

So, I've bought the correct type which should (hopefully)

solve the problem

macafee2 · 25th August 2018, 20:47

Quote:

Originally Posted by suzublu

Ian, on checking the battery fitted, the specs are too low for our cars, which need a strong amperage for starting & running all the leccy bits. The old chaps family bought a cheap battery so they could sell it, not knowing what type

So, I've bought the correct type which should (hopefully)

solve the problem

it would crank better and for longer as I assume the battery fitted even if wrong will crank the engine and perhaps even start the car. My only concern was you saying flat. Apologies if I'm way off beam here

I could be about to show my ignorance
once running and the alternator has fully charged the battery, how much influence does the battery have? I'm assuming the alternator of a car produces enough umph above x revs to run all the electrics and the need for the battery is only to complete a circuit when engine is above x revs and below x revs to power the car as the alternator is not producing enough.

macafee2

HarryM1BYT · 25th August 2018, 21:36

Quote:

Originally Posted by macafee2

I could be about to show my ignorance
once running and the alternator has fully charged the battery, how much influence does the battery have? I'm assuming the alternator of a car produces enough umph above x revs to run all the electrics and the need for the battery is only to complete a circuit when engine is above x revs and below x revs to power the car as the alternator is not producing enough.

macafee2

The alternator is capable of almost supporting the maximum electrical load, at a tick-over. The problems happen, when there is volts drop, when trying to crank a cold, large engine over - that's when the CCA really matters and CCA is closely related to the amp/hour of the battery.

Comfortably Numb · 26th August 2018, 14:43

A 75ah battery should be able to turn over an engine, normally supplied with a 110ah battery. Have you got a modern battery charger that will tell you what Volts it is producing? Fully charged, should be giving at least 12.8v, I usually find below 12.3V it won't have enough to start a cold diesel (glow plugs + starter motor requires too much power).

suzublu · 26th August 2018, 14:48

The battery fitted is a 60ah, fitted as a stop gap by the family to start the car for selling. To clarify, the car is 17 years old with 16k miles, it never went on long journeys, I assume, to keep the battery charged, so the original was replaced with the "little" one

Dorchester2 · 26th August 2018, 18:50

I've just changed my battery.

When I bought the car one year ago, it had been fitted with a cheap down market battery. Enough power but cheap and God only knows how old it was.
The battery was on charge every time the car was in the garage. Hence well maintained.

I bought a 70Ah 720A Banner AGM start & stop. Expensive & a tad overpowered though but given to last twice as long as a standard one.
But far better to have got an overpowered than an underpowered one, don't you agree?

I fitted it a few days ago.
Going at my daughter's, I've just tested it today.
The engine start-up is impressive: the starter is working better & faster and that makes a massive difference particularly while the engine is fuelled with ethanol (it's well-known that starts-up may be a little uneasy sometimes with E85)!
I'm amazed & chuffed!

Comfortably Numb · 26th August 2018, 20:02

Just checked, - if the green one is also a 1.8L, a 60Ah battery should be adequate, especially at this time of year, if fully charged.

25th August 2018, 12:19	#1
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,969 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Flat Battery Went to move the green one this am so I could get blingy out ready for mot pre-checking and...............Click Flat battery Now when I bought it, the family said it kept going flat(obviously never used much) so they bought a new one, but this also kept going flat. On checking the battery, it's the wrong one Not nearly big enough for our cars Had a look at ECP & they've got a sale on, Bosch S4 075 with 4 year guarantee, was £117.99, now, delivered, £66.84 Result

25th August 2018, 16:28	#2
VVC-Geeza This is my second home 2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe. Join Date: Nov 2009 Location: Derby. Posts: 8,822 Thanks: 2,022 Thanked 1,016 Times in 739 Posts	ECP prices are excellent with their discount codes applied Ronnie.I have recently replaced the batteries on both the 75 and 45 with Exide one's from them,each have a four year guarantee.Can't fault them. __________________

26th August 2018, 18:50	#9
Dorchester2 incurable Rover addict Rover 75 Saloon V6 2.5 1999 - Rover 25 1.4 2002 - Rover 214i cab 1994 - Rover P5b coupe 1968 Join Date: Sep 2017 Location: Bioule. South West of France. Posts: 1,648 Thanks: 612 Thanked 385 Times in 223 Posts	I've just changed my battery. When I bought the car one year ago, it had been fitted with a cheap down market battery. Enough power but cheap and God only knows how old it was. The battery was on charge every time the car was in the garage. Hence well maintained. I bought a 70Ah 720A Banner AGM start & stop. Expensive & a tad overpowered though but given to last twice as long as a standard one. But far better to have got an overpowered than an underpowered one, don't you agree? I fitted it a few days ago. Going at my daughter's, I've just tested it today. The engine start-up is impressive: the starter is working better & faster and that makes a massive difference particularly while the engine is fuelled with ethanol (it's well-known that starts-up may be a little uneasy sometimes with E85)! I'm amazed & chuffed! __________________ Rover 75 V6 2.5 Auto Connie born 1 July 1999, 24 kOhms resistor, 10 kOhms manual starter, full E85, modified airbox, full derestricted SS exhaust line, power & torque remap -> 202 bhp This vehicle was the 7,517th 75 to run off the production line, out of 112,381 This vehicle was the 1,190th 75 2.5 V6 Contemporary to be made out of 8,214 This vehicle was the 2,032nd 75 in Atlantic Blue Pearlescent (code: JEY) to be made out of 2,572 Atlantic Blue Pearlescent 75s

25th August 2018, 19:24	#3
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,991 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	is the size of the battery the reason its flat? from your description I would be looking for something else. if the battery was fully charged would it start the car? if fully charged and it still has not the guts to turn the engine over and start it fair enough but flat.... what is the cause? macafee2

26th August 2018, 14:43	#7
Comfortably Numb Posted a thing or two Rover 75 Saloon Join Date: Dec 2017 Location: Penrith Posts: 1,336 Thanks: 165 Thanked 303 Times in 241 Posts	A 75ah battery should be able to turn over an engine, normally supplied with a 110ah battery. Have you got a modern battery charger that will tell you what Volts it is producing? Fully charged, should be giving at least 12.8v, I usually find below 12.3V it won't have enough to start a cold diesel (glow plugs + starter motor requires too much power).

26th August 2018, 14:48	#8
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,969 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	The battery fitted is a 60ah, fitted as a stop gap by the family to start the car for selling. To clarify, the car is 17 years old with 16k miles, it never went on long journeys, I assume, to keep the battery charged, so the original was replaced with the "little" one

26th August 2018, 20:02	#10
Comfortably Numb Posted a thing or two Rover 75 Saloon Join Date: Dec 2017 Location: Penrith Posts: 1,336 Thanks: 165 Thanked 303 Times in 241 Posts	Just checked, - if the green one is also a 1.8L, a 60Ah battery should be adequate, especially at this time of year, if fully charged.