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post #1 of 12 (permalink) Old 07-06-2017, 10:07 Thread Starter
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TF Battery problems

I've just put a new basic V-power 50 AH battery in my TF. I was away for 3 weeks and on return it was flat. Is this normal? I charged it and checked it out afterwards; 12.2 volts with only 0.04 amps standing current once in the car so don't think that I've any parasitic current drain.
Any thoughts folks? Thanks - from a new TF owner...
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post #2 of 12 (permalink) Old 07-06-2017, 11:04
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Did you check the voltage before fitting the battery?

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post #3 of 12 (permalink) Old 07-06-2017, 11:38
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Firstly, I don't think a 50Ah battery is large enough for the TF. Rover used to fit a 40Ah to versions of the MGF without electric power steering, but I am pretty sure the standard fit battery for the TF was a 63Ah.

Even so, a new battery shouldn't drain in 3 weeks. If you are confident there is no parasitic drain (0.04 amps is perhaps fractionally higher than normal, but not significantly so - should usually get 0.02 to 0.03 amps), either the battery wasn't properly/fully charged when it was fitted, or the battery is a duff one. Your reading of only 12.2 volts seems a bit low - a fully charged strong battery should be around 12.6 volts (after being left to settle for a few hours after charging). Immediately after charging, it should read something around 13.2 volts.
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post #4 of 12 (permalink) Old 07-06-2017, 14:32
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Batteries going flat on TFs, in particular, is a very common problem. Mine did it all the time I owned it, for 10 years. I never solved it other than buying a maintenance charger and connecting it up if the car was left for more than 3 days.

For the summer I successfully used a solar charger located on the rear shelf and plugged into the ciggie lighter socket as the car was kept outside. Unfortunately it wasn't good enough for the low light levels in the winter so the car was plugged into the mains charger.
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post #5 of 12 (permalink) Old 07-06-2017, 16:59
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Can the alarm system when armed drain the battery? If I leave my MGF unlocked and unarmed then the battery is fine, not the case if left alarm activated, I now have a host of trickle chargers!
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post #6 of 12 (permalink) Old 10-06-2017, 13:21
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Quote:
Originally Posted by Man in the Car View Post
Firstly, I don't think a 50Ah battery is large enough for the TF. Rover used to fit a 40Ah to versions of the MGF without electric power steering, but I am pretty sure the standard fit battery for the TF was a 63Ah.

Even so, a new battery shouldn't drain in 3 weeks. If you are confident there is no parasitic drain (0.04 amps is perhaps fractionally higher than normal, but not significantly so - should usually get 0.02 to 0.03 amps), either the battery wasn't properly/fully charged when it was fitted, or the battery is a duff one. Your reading of only 12.2 volts seems a bit low - a fully charged strong battery should be around 12.6 volts (after being left to settle for a few hours after charging). Immediately after charging, it should read something around 13.2 volts.
Agree, I had a 44Ah battery from Halfords which was always running out of juice. Replaced it with a Bosch 63Ah one from ECP, no problems since

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post #7 of 12 (permalink) Old 12-06-2017, 23:50
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You need a minimum 63ah battery for a TF.
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post #8 of 12 (permalink) Old 13-06-2017, 08:53
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I would have thought a 50Ah battery would be fine for anything other than very cold starts, one of the problem is once a modern lead acid battery has completely discharged it doesn’t seem to recover very well and may lead to higher internal discharge.

Presumably the alternator is charging the battery?
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post #9 of 12 (permalink) Old 14-06-2017, 22:34
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I think the recommended battery is a type 063 which isn't necessarily a 63Ah battery. Certainly the Bosch S5 063 I had in mine had a 52Ah capacity and was fine for my F with electric steering. Never missed a beat. Awesome batteries, but now at a fairly scary price thanks to the fall in the pound.
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post #10 of 12 (permalink) Old 14-06-2017, 22:37
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After further thought I'm now doubting myself and wonder if I had an 075 rather than 063 in the F. Given the same battery's now in my father's Almera and still going strong, I'll take a look at the weekend.
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post #11 of 12 (permalink) Old 15-06-2017, 09:46
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Quote:
Originally Posted by 1Leigh View Post
I think the recommended battery is a type 063 which isn't necessarily a 63Ah battery. Certainly the Bosch S5 063 I had in mine had a 52Ah capacity and was fine for my F with electric steering. Never missed a beat. Awesome batteries, but now at a fairly scary price thanks to the fall in the pound.
The 063 and 075 designations simply define the physical size of the battery, the 075 being longer than the 063.

The actual Ah rating depends on the manufacturer, the battery chemistry (and the sales/marketing philosophy! ). 063s are generally about 50Ah, while 075s are about 60Ah.

The other important variable is the Cold Cranking Amps (CCA) which as the name suggests, is a measure of the battery's starting power, the higher the better.
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post #12 of 12 (permalink) Old 21-06-2017, 09:24
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Quote:
Originally Posted by Xamb416 View Post
The 063 and 075 designations simply define the physical size of the battery, the 075 being longer than the 063.

The actual Ah rating depends on the manufacturer, the battery chemistry (and the sales/marketing philosophy! ). 063s are generally about 50Ah, while 075s are about 60Ah.

The other important variable is the Cold Cranking Amps (CCA) which as the name suggests, is a measure of the battery's starting power, the higher the better.
Thanks for the clarification. Mine's a Bosch 075 at 60 Ah. Great battery.

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