I been with Weize for years. I first bought dual AGM Group 31 batteries for my 4runner and winch and stereo. Ran them in parallel. Mega power. good quality. Now i wanted to reduce weight so I bought dual Purpose 105ah LiFePO4 batteries. Charged each one to 99% let them rest. charged them again to match voltage within 1mv. hooked them, up in parallel with no loads and let them sit for a day and half. everything was perfectly balanced to almost 0mv which was amazin.
These LiFePO4 batteries make my stereo play SO MUCH cleaner. The difference is insane!
The difference between voltage on AGM verses LiFePO4 is very noticeable The winch operates even better too. You get voltage sag and drop with AGM even in parallel banks. With LiFePO4 you get none of that.
however, i ran into a rookie issue that you should not repeat.
DO NOT CHARGE balanced parallel batteries to 100% like i did. Everything before this was balanced when discharging and charging as long as the BMS over voltage didnt trigger at 100% which each battery charges to 100% at different times due to slight capacity variations between the 2 batteries cell packs. Its a known thing that i didnt know.
I learned in days to only charge 80% to 99%. Most winch users report charging to 80% with voltage diodes or mods that dont push 14.6. You must charge at a voltage lower than its individual rating.
I was told to charge till the batteries reach 13.8volts and youll be somewhere at 80%. An unbalance came when one battery reached 100% at 14.1 volts and the other kept going to 14.5 volts!!! Then I learned people specifically dont charge banks to 100% due to this BMS trigger. To overcome this issue you need a programmable absorption voltage charger thats dc to dc like the Victron Orion XS 50 amp charger. Program the bulk, the absorption and float to whatever voltage you want. I wish Weize made their own.
overall after learning the world of lifepo4 batteries, as long as you can afford the right charger to use like the Orion XS, its a worlds difference in power delivery.
