I held off one day on Rock Auto and they dropped price on the battery by $5 but shipping got cut in half. I ordered the Deka 9A34R for $210 delivered
What provisions does that battery have for temperature controlled charging? What modifications did you do to your charging system to keep that battery happy during recharging?I've run an AntiGravity LiFePO4 for about a year now in my daily driver 2nd gen taco. Maybe a couple dozen starts around 10 degrees or less a few of them into the negatives, but only this past winter so far. A handful of 3hr+ drives. Makes the starter sound like its on the roids too, cranks quick. LiFePO is much more stable than the older lithium battery styles like you guys are referring to, especially with a good battery management system built in like the antigravity ones have. Lotsa sportscars have them as factory options now
Don't get me wrong tho, i think i'm one of the first few to get one for a taco so knew i was taking a bit of a risk trying it out. And i'm not sure how it would handle quick temp drops like yall get in the desert but idk if that'd be any different from me running mine on cold days with it in the stock spot
No mods; thought about a voltage monitor of some kind but i haven't even checked it once yet to see how it does (at this point i'm a little nervous that i'd start having problems as soon as i did start keeping an eye on it). No idea if it does anything to control temps when charging either. Not sure that's an issue with the newer FePO4 typesWhat provisions does that battery have for temperature controlled charging? What modifications did you do to your charging system to keep that battery happy during recharging?
Any drop in replacement LiFePO4 HAS to have a built in BMS otherwise the battery go kaput very quickly.
There are plenty of DIP batteries these days and some have built in heaters for cold temp charging, but without a reliable way to boost charge voltage up into the 15v range there is not way to realize the long cycle life of that chemistry
At least they have a BMS. Definitely do not have any temperature based charge protection though.No mods; thought about a voltage monitor of some kind but i haven't even checked it once yet to see how it does (at this point i'm a little nervous that i'd start having problems as soon as i did start keeping an eye on it). No idea if it does anything to control temps when charging either. Not sure that's an issue with the newer FePO4 types
And quite a few didn't have BMS when i was looking around. Braille is the big dog company for automotive and theirs don't. Same with many of the ones made more for solar power storage. 50/50 from what i saw. I guess those are all just meant to be put on a tender anytime they're not in use
Maybe i'll look into a voltage booster of some kind
I think you got it all figured out there. It's a bit of overkill so starts are easy and don't drain it much. Pair that with driving hard/lotsa revs basically anytime there's no cars in front of me (often out here in the hills) and prioritizing light weight with pretty much every mod. My alternator always has it's chances and the battery probably doesn't get stressed muchAt least they have a BMS. Definitely do not have any temperature based charge protection though.
The biggest clue about their set up is the 7-9 year life expectancy.
To be honest that is pure garbage. A probably set up system with that battery chemistry should at least double that life.
The biggest draw is obviously during starting and that does drain the battery quite quickly, but if properly sized that will still be less than a 50% DOD. And if kept within 75% max charge and 25% max at discharge a battery set up with that chemistry will do almost 10k cycles.
Solar set ups that do more than 50% DOD are still looking at near 7500 cycles.
Be interesting to see your results with that battery. Keep us informed.
You could run the agm in the cab with a fuse box completely separate and just keep enough extra cable to switch between either if one goes out and you need to use something or start the truckThat Antigravity seems impressive at 16# and $800+. I'm super curious and can always move my 50# AGM to the cargo area to save weigh up front
I was thinking about a 4-way.switch like thisYou could run the agm in the cab with a fuse box completely separate and just keep enough extra cable to switch between either if one goes out and you need to use something or start the truck
I was thinking about a 4-way.switch like this
I could use a switch like that as a theft deterrent/house battery switch and toggle to charge both batteries on demand vs full time charge both batteries
Thats a good one. I got similar but only on/off. Just finished relocating battery. Easy peesy
Blue Sea 9001e E-Series Master Marine 4-Position Dual Boat Battery Selector Switch - Off / 1/1+2 (Both) / 2: Amazon.com: Industrial & ScientificBlue Sea 9001e E-Series Master Marine 4-Position Dual Boat Battery Selector Switch - Off / 1/1+2 (Both) / 2: Amazon.com: Industrial & Scientificwww.amazon.com
Blue Sea Systems Automatic Charging Relays (ACRs) https://www.amazon.com/dp/B001VIXLRO/ref=cm_sw_r_awdo_77RDA0MH9B8MEFEGAZQ1Chatted with Antigravity today, their batteries cannot be wired in series or parallel with other battery technologies. Also, their automotive batteries cannot be used for high draw applications, like winching.
Here is what they recommend for a dual battery heavy-draw application, like my intent.
Primary battery, something small like ATX30-HD or Group 51R
Antigravity Group-51R Hi-Power lightweight Lithium Automotive Battery with RE-START Technology. Replace lead/acid battery in Hi-Performance Cars.antigravitybatteries.com
Secondary battery, for high draw like winching, they recommend a deep cycle, I told them I'm going to use an AGM.
They recommend a battery isolator, and while they don't sell one, I found several online. Example:
View attachment 79015
I'm leaning toward the ATX30-HD under hood with the Deka AGM in the back with the Delco 140A alternator charging both through an isolator in the engine bay. That will allow me to cable the winch off the AGM off the isolator as well as my OBA compressor in the rear off the AGM.
The ATX30-HD has 4 terminals which means it will fit in any post orientation, and the "unused" terminals can be used for a solar panel for secondary charging or be capped off.
Heres what this project looks like, financially:
ATX30-HD battery $560
Standard Terminals $14
Battery Isolator $100 (estimated)
Deka 9A35R $200
Battery tie down $50
Delco 140A alt $114
Wire, connectors ~$120
And.... typical LiFePo4 batteries have both a high charge and discharge rate. Perhaps because of the relatively small capacity of the battery they do not recommend it for winching.Blue Sea Systems Automatic Charging Relays (ACRs) https://www.amazon.com/dp/B001VIXLRO/ref=cm_sw_r_awdo_77RDA0MH9B8MEFEGAZQ1
This. Will isolate and allow you to self jumpstart at the flick of a switch