Battery (1 Viewer)

May 22, 2021
74
24
Manchester, UK
Funster No
81,402
MH
Elldis acordo 105
Exp
Caravan for 50 years motorhome since 2019
Just had my habitation inspection on the motorhome and they told me my battery failed a drop test the battery is only 4 years old and they said it is because I leave it plugged into the mains over winter when it’s laid up and they told me to only plug it in every 3/4 weeks I had a caravan for nearly 50 years and didn’t have that problem with the battery on that (what’s the best way to keep it topped up) I’ve took it off charger in up and it’s holding a good charge
Cheers Arthur.
 

hja

May 8, 2020
980
3,235
Lincolnshire
Funster No
70,433
MH
Globecar Summit Prim
Exp
Since 2019
I don’t know anything about the science of this but was under the impression that it was not good to leave on hook up without some usage taking place.
 
Apr 3, 2018
3,768
10,516
Funster No
53,151
MH
PVC
Exp
1995-2004 & 2017》
Just had my habitation inspection on the motorhome and they told me my battery failed a drop test the battery is only 4 years old and they said it is because I leave it plugged into the mains over winter when it’s laid up and they told me to only plug it in every 3/4 weeks I had a caravan for nearly 50 years and didn’t have that problem with the battery on that (what’s the best way to keep it topped up) I’ve took it off charger in up and it’s holding a good charge
Cheers Arthur.
Battery type????
 
OP
OP
A
May 22, 2021
74
24
Manchester, UK
Funster No
81,402
MH
Elldis acordo 105
Exp
Caravan for 50 years motorhome since 2019
6F72A450-7EDD-4A3F-B623-7F89E6225697.jpeg
 

pappajohn

LIFE MEMBER
Aug 26, 2007
43,452
50,448
Dark side of the moon
Funster No
172
Exp
Since 2005
All depends on the charger.
If it's a modern intelligent charger it could be left on for years.
If it's an old analogue charger it would most likely overcharge the battery and boil it dry over time

If what they say was the problem the battery wouldn't have lasted 4 years.
More likely it's losing capacity due to age.

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OP
OP
A
May 22, 2021
74
24
Manchester, UK
Funster No
81,402
MH
Elldis acordo 105
Exp
Caravan for 50 years motorhome since 2019
The motorhome is only 4 years old and the battery came with the motorhome new
 
Nov 13, 2011
1,493
3,597
Lincolnshire
Funster No
18,889
MH
PVC
Exp
30 years
I would carry out a capacity test on the battery before condemning it. If you are not sure, you will find plenty of know how on the web. Or come back here for more details of how to do it.

Geoff
 
OP
OP
A
May 22, 2021
74
24
Manchester, UK
Funster No
81,402
MH
Elldis acordo 105
Exp
Caravan for 50 years motorhome since 2019
Can you please give me more information

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Aug 26, 2008
4,795
25,505
B&NES
Funster No
3,823
MH
Van Conversion
Exp
since 2007
The motorhome is only 4 years old and the battery came with the motorhome new

The build date of the conversion, when the battery was fitted, is more relevant than the DVLA registration date. Your battery could be nearer 5 years old than 4.
 
Apr 30, 2018
2,025
4,528
Mid Suffolk
Funster No
53,655
MH
Adria Matrix 670DC
Exp
Motorhoming since 2018.
That looks like a work bench well used. good on ya. Mines exactly the same, as for the record vice its seen many years of good service, but loathed to replace it.
 
Dec 2, 2019
4,181
9,386
South Lincolnshire
Funster No
67,140
MH
Rapido 7065+
Exp
Broken most bits now
Just go off grid with it for a couple of days and don't worry about it - there's lots of other things in that moho to be worried about :ROFLMAO: :ROFLMAO:
 
Dec 2, 2019
3,659
7,907
Amersham
Funster No
67,145
MH
van conversion
Exp
Since 2019
Why would you drop test a leisure battery? Who in their right mind think that you will need healthy cranking battery in the back?
Drop test is for cranking battery test, not for leisure. The leisure battery will never see cranking use, so it’s not built for that. Of course will never perform a drop test.
Useles ppl.
You can do a capacity test, not a drop test. I guess that takes time and right equipment for logging the results, so they skip and kill the leisure with a jolt of drop test.
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
54,183
153,099
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
Can you please give me more information
First charge the battery fully and leave it to settle for an hour then:-

Disconnect all charging methods.

For example if it's a 100a/h battery load it with a 5 amp load and run for 5 hours, this will represent a 25% discharge. (adjust load/time to suit the size of the battery)
Disconnect the load and leave to stand for at least 30 min then measure the voltage.
Repeat the test and you will have discharged the battery to 50%.
You can repeat again then it will be 75% discharged.

1676577978308.png

Anyone who drop tests a leisure battery obviously hasn't a clue.

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Nov 13, 2011
1,493
3,597
Lincolnshire
Funster No
18,889
MH
PVC
Exp
30 years
Can you please give me more information
Hi
You will need a multimeter.
First thing make sure the battery is fully charged, then leave to stand for a few hours.
Make a note of the battery voltage and the time.
Place a known value load on the battery of between 5 and 10amps. You could use a headlamp bulb for instance. A 60w bulb will draw 5amps.
Leave the load on and regularly check the battery volts.
When the battery has dropped to 10.5 volts make a note of elapsed time.
To calculate the battery capacity: If you used a 5amp load and it lasted 12hours then the capacity is 5X12=60amp hours. If you used a 10amp load and it lasted 7hours 10X7=70amp hours.
Compare this figure with the stated capacity of the battery and you will have a good indication of its condition.

Geoff

I see Lenny has given you a different regime, while I was battling with my keyboard.
 
OP
OP
A
May 22, 2021
74
24
Manchester, UK
Funster No
81,402
MH
Elldis acordo 105
Exp
Caravan for 50 years motorhome since 2019
Thanks to you all for all the information (the battery is a 110Ah battery) for those how are doing the calculations for me
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
54,183
153,099
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
Thanks to you all for all the information (the battery is a 110Ah battery) for those how are doing the calculations for me
At 4 years old the capacity will be 99 ah, so use my figures for 100ah.

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OP
OP
A
May 22, 2021
74
24
Manchester, UK
Funster No
81,402
MH
Elldis acordo 105
Exp
Caravan for 50 years motorhome since 2019
It’s never been deep discharged it’s always been on Eu on sites or in the back garden
 
Feb 6, 2019
406
932
Santa Maria de Palautordera, Barcelona, Spain
Funster No
58,389
MH
LMC Liberty 560 1992
Exp
Since 2017
IMHO it depends a great deal on the brand and the use. Today I replaced a (presumably) 80-90ah starter battery (it has no markings on it at all) with a brand new yellow-pack 95ah after owning the van for almost 6 years.

I had to get the leisure battery replaced in 2019 after the charging circuit was validated dead by a garage - not even the 12volt fridge worked by then - and after throwing money at it, everything still works well for the moment - tho I don't know what battery it is.

The starter battery did sterling service for 5 years but got dodgy over the last year. I had always tried to run the van at least a bit to make sure that something was recuperated from each start as they can be few and far between at times, but recently the charge hadn't been holding for long and I had lucky breaks as recently as early-Feb following charge & a drive which later only turned the engine over slowly but it caught in the end - God be with SOFIM!

I intend to repurpose the old battery as an away-from-the-house source for LED garden lights!

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May 7, 2016
7,377
12,021
West Sussex
Funster No
42,951
MH
Malibu Van 640 LE K
Exp
Since 2003
Would a drop test damage a real leisure battery? I thought that leisure batteries had heavier plates with less surface area so that they can withstand deeper discharge but as a result should not be expected to deliver cranking level Amps.
 
Dec 2, 2019
3,659
7,907
Amersham
Funster No
67,145
MH
van conversion
Exp
Since 2019
Would a drop test damage a real leisure battery? I thought that leisure batteries had heavier plates with less surface area so that they can withstand deeper discharge but as a result should not be expected to deliver cranking level Amps.
At some extent yes, as you know the starter cranking has thin multiple plates to increases surface are, capable for huge short bursts: cranking. On leisure the C/5 it’s kind of the limit before it start to shed its active material of the plates. This happens, due to excessive discharge rate, several C’s. Well beyond for what was designed to do.
 
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