Interesting DocT I read that these batteries are better for bringing back from flat over convention lead acid so I'm suprised to hear of your experience. Did you use a charger with a AGM feature on it?My Optima died a quick death and unlike traditional batteries it was impossible to bring it back to life when the voltage had dropped. (Yes my fault for not checking the charger but still).
I've seen plenty of good reviews on the optima and seems like a tried/tested upgrade over the OE battery.The Optima put out WAY more than their published stats. Check out the various videos from the states where people test them. I use them because when I used to fit car hifi systems they were the go to battery. They should be able to discharge and recharge reliably and are able to deeply discharge and recover, which is why old skool car hifi with inefficient class A/B amps drawing massive current (amps) needed good deep cycle batteries.
Not to say the other batteries are not as good, I imagine the technology has moved on a bit, but don't let the rated CCA and Ah stats necessarily fool you into thinking one is better than the other. Interesting what DocT said though, usually AGM batteries can hold charge better and like I said, Optima (and Stinger) batteries have a good rep.
I think the Halfords Yuasa batteries are worth a think. I've used several over the years (the more expensive one) and they've been brilliant. Even when I used a normal (cheaper black) one it was good for occasional use (static caravan security during winter). When it died after 3 seasons and 2.5 years I just took it to Halfords and they replaced it no problem. Good value.
The LiFePo4 is great and lasts forever - as an example a lead acid battery has about 500cycles before degradation starts to show but a Lithium Iron can do 5000-7000 cycles. Only thing they need to have low temp cut off, if not on first time bellow 0 it will get damaged.Good to know. I've seen these lithium ion sulphate batteries made in the UK by deadweight industries and they do a battery suitable for the GTR. It has an impressive specification of 60ah and 650cca but doesn't come cheap at £450 however comes with an approximate weight saving of 8 KG.
Save over 17kgs with the Latest Lithium Iron Phosphate (LiFePO4) Battery Technology All our products use the latest lithium battery technology (Lithium iron phosphate - LiFePO4). The focus here is to better the performance of a lead-acid battery at a fraction of the weight. Only 3.5 kg, 2 year...www.deadweightindustries.co.uk
As in you have the battery disconnected below 0 degrees?The LiFePo4 is great and lasts forever - as an example a lead acid battery has about 500cycles before degradation starts to show but a Lithium Iron can do 5000-7000 cycles. Only thing they need to have low temp cut off, if not on first time bellow 0 it will get damaged.
No, only charging is disabled while bellow 0. You can safely discharge a LiFePo4 bellow 0 no problem. Charging it is what it breaks it.As in you have the battery disconnected below 0 degrees?
The plan going forward because I don't have power in my garage will be to fit a battery isolator when the car isn't in use and periodically trickle charge to keep it topped up.
yes, I'm quite sure they have low temp disconnect . some batteries have also a heating element in them so you can use them in really cold places.So it's worth checking this feature with any manufacturer first as an insurance policy and potentially a battery that could last the life of the car?