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wow... nice... (y) the battery that I'm going to use is Lishen with 16Ah capacity, but have nominal voltage at 2.5v... So it will be going to 5S with discharge spec, hope it will enough to start the car... ? already ordered, but due to chinese new year holiday, the shipment become postponed ?

I also in progress to build a LTO for another purposes (car starter battery) My plan is to use protection board of Super capacitor to regulate the charging voltage.... Afaik the protection board will be limiting the maximum voltage but there is no current regulating.... And since it using...

@JimJr did you use one of these kind of super capacitor protection board for voltage balancing and limiter....? Have read in some forum, those kind of board mostly use U1 with TL431, but they have wrong PCB path... It should use TL432 instead If those board use TL431, it won't work as...

Have a plan to build like these (the photo is not mine)... since Lishen have voltage 2.5volt, with max charging voltage at 3 volt, so 5S could be enough...

Did you use it as car starter...? 5s or 6s...?

Stil considering to build car battery to replace my 2.5 years old FLA... Anyone have experience use 5s configuration with this brand...? Since the voltage is 2.5v, not 2.3v as yinlong does... And have max 50C discharging spec...

@fafrd , I already purchased the SUN-1000GTIL2 (but not delivered yet), seem it same as yours. Kindly share your current block diagram of installation, it will very help me for installation plan... TIA..... https://www.aliexpress.com/item/32833599191.html

currently I'm on progress to build a kind of "Power Box" for my car... and to fill the "missing component" on your system, I used a equipment which maybe suit with your situation... The box consist of Atempower and DC-AC inverter... The battery was installed out of the box... Still ongoing...

Try to look up for smart switch with Sonoff POW R2 or Sonoff Dual R3, maybe my suggestion suits your need...

Video shown lesser voltage drop with capacitor...