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Mar 22, 2021 3:58 pm
Mar 22, 2021 3:58 pm
Subject: Re: Battery advice for LG45
Hi David,
Amp / hours I think is not so much output as an indication of how long the battery can sustain under load. The original equipment for my V12 and LG6 was 2 Lucas SLTSR15E batteries, and I daresay the same for the LG45. Unfortunately I've tried previously to find a specification for that number, but without success; even the classic batterymaker (Lincon I think) I spoke to had no clue!
Firstly, I think I'm correct in saying the Ah won't increase, just the voltage, with a pair of batteries, necessarily connected in series. When I bought my V12, it came with a huge pair of Crompton Parkinson batteries, which must have been seriously larger than those originally specified. Quite why the previous owner fitted those I'm unsure; modern batteries are more efficient so a smaller battery would undoubtedly be just as good. All I can say is that the CP batteries ensured starting was never a problem!
My LG6 came fitted with a DETA 77Ah battery, which worked fine, and was probably unnecessarily powerful. I ran the car for severald days on the Champagne rally with no charging due to a fault with the regulator. That battery of course didn't survive my LG6 being laid up 2000 -2016, so I used the Shield 291 battery from my RMB, which had thoughtfully run a big end. The Shield battery is 58Ah, and had no problem starting the LG6 ... with the proviso that compressions are low due to idiot "professional engineers" machining out the bores too far. I've run the car day and night over considerable mileages, and never had a problem. Given that, I think the 71Ah one would give you sufficient margin.
I am still recommissioning my V12, and ideally hope to find 6v batteries for that that are dimensionally correct, have original appearance (visible bus bars), and ideally will be correct enough for the original battery retaining bars to be used. I've measured up, and the batteries would need to be 26-27cm long at the top surface, have a maximum body width below the top of 20cm, and be 16 - 18cm tall, measured from the battery base to the top surface of the battery.
Hopefully this is of some help to you. Do your dimensions tally with mine?!
If anyone has come across a battery supplier able to supply such dimensionally correct batteries, please let me know!
Laurence
Hi David,
Amp / hours I think is not so much output as an indication of how long the battery can sustain under load. The original equipment for my V12 and LG6 was 2 Lucas SLTSR15E batteries, and I daresay the same for the LG45. Unfortunately I've tried previously to find a specification for that number, but without success; even the classic batterymaker (Lincon I think) I spoke to had no clue!
Firstly, I think I'm correct in saying the Ah won't increase, just the voltage, with a pair of batteries, necessarily connected in series. When I bought my V12, it came with a huge pair of Crompton Parkinson batteries, which must have been seriously larger than those originally specified. Quite why the previous owner fitted those I'm unsure; modern batteries are more efficient so a smaller battery would undoubtedly be just as good. All I can say is that the CP batteries ensured starting was never a problem!
My LG6 came fitted with a DETA 77Ah battery, which worked fine, and was probably unnecessarily powerful. I ran the car for severald days on the Champagne rally with no charging due to a fault with the regulator. That battery of course didn't survive my LG6 being laid up 2000 -2016, so I used the Shield 291 battery from my RMB, which had thoughtfully run a big end. The Shield battery is 58Ah, and had no problem starting the LG6 ... with the proviso that compressions are low due to idiot "professional engineers" machining out the bores too far. I've run the car day and night over considerable mileages, and never had a problem. Given that, I think the 71Ah one would give you sufficient margin.
I am still recommissioning my V12, and ideally hope to find 6v batteries for that that are dimensionally correct, have original appearance (visible bus bars), and ideally will be correct enough for the original battery retaining bars to be used. I've measured up, and the batteries would need to be 26-27cm long at the top surface, have a maximum body width below the top of 20cm, and be 16 - 18cm tall, measured from the battery base to the top surface of the battery.
Hopefully this is of some help to you. Do your dimensions tally with mine?!
If anyone has come across a battery supplier able to supply such dimensionally correct batteries, please let me know!
Laurence