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ncwa · 10-31-2011, 01:25 AM

I pulled my 36lb lead battery out of my ‘66 Mustang and replaced it with a 16 Ah custom Headway LiFePO4 pack and BMS (total weight of 4 lbs!). This was a great solution but only worked well for about a month. Over time the battery started to loose cranking amps and eventually it would not start the car. At the time I was having a little bit of trouble with my low voltage relay so I might have dropped below the 2V min limit. I have since switched back to lead. However rather than the original 90 Ah battery, I am using a smaller 45 Ah 19 lb battery. This has been working well but I do keep a close eye on its charge. I think this would work for a smaller engine in a warm climate. (As a disclosure, the Ah rating of my battery is not as critical as I also have a 25 amps coming from my DC/DC converter and I can practically start the car with my e-drive if needed)

10-31-2011, 01:25 AM	#32 (permalink)
ncwa www.howtobuildahybrid.com Join Date: Oct 2011 Location: California Posts: 20 Thanks: 1 Thanked 3 Times in 3 Posts	Headway LiFePO4 Starter Battery I pulled my 36lb lead battery out of my ‘66 Mustang and replaced it with a 16 Ah custom Headway LiFePO4 pack and BMS (total weight of 4 lbs!). This was a great solution but only worked well for about a month. Over time the battery started to loose cranking amps and eventually it would not start the car. At the time I was having a little bit of trouble with my low voltage relay so I might have dropped below the 2V min limit. I have since switched back to lead. However rather than the original 90 Ah battery, I am using a smaller 45 Ah 19 lb battery. This has been working well but I do keep a close eye on its charge. I think this would work for a smaller engine in a warm climate. (As a disclosure, the Ah rating of my battery is not as critical as I also have a 25 amps coming from my DC/DC converter and I can practically start the car with my e-drive if needed)