I am trying to put together a cheap QRP setup. I am using what I have along with some stuff I purchased. I am not terribly concerned with weight, but it was a consideration. I bought a 12Ah LiFePo4 battery off Amazon. https://www.amazon.com/dp/B07JF56C7L/ref=cm_sw_r_cp_apa_i_Y3E9DETBX2JGDDBS7RJB?_encoding=UTF8&psc=1 I am trying to determine if it actually has a BMS internal. I bought this charger. I needed a better SLA charger, and this one said it does lithium. I'm not so sure it actually does...... https://www.amazon.com/dp/B087BXGK3Z/ref=cm_sw_r_cp_apa_i_NQSMM9WV6MRD3Q7F7DNC?_encoding=UTF8&psc=1 Because I thought it would be neat, I bought this battery monitor. https://www.amazon.com/dp/B07T8GN61Z/ref=cm_sw_r_cp_apa_i_0RB7091HBJ32QV1WCY24?_encoding=UTF8&psc=1 I actually bought two of the batteries. One for my kids' power wheels, and one for radio. I labeled the batteries #1 and #2. Out of the box, both batteries read 12.4V. I connected #1 to the charger set to "Lithium Battery" and the charger displayed 12.8V and 0.0A. I tried batt #2, and got the same results. I let the charger sit like that for a few hours, and there was no change. I got to thinking that maybe the batteries were already fully charged (I know they should be higher than 12.4V, but I thought maybe they were bad, or damaged etc). I figured I would try to discharge them, and then charge them up. I connected batt #2 to a 14ohm 100W resistor, and let it discharge for about 2 hours. I had not yet connected the all-in-one battery monitor so I connected one DMM for V and another for A. I saw a load of about 750mA and I let the voltage drop down to 10.9V. At that point, I got scared and disconnected the resistor. The battery recovered to 11.098v. I decided to push my luck and reconnected the battery, and I let it drop to 10.800v, got scared again and disconnected - the battery recovered to 11.016v. The TalentCell website states the battery can provide as low as 9V. It doesn't specifically mention a BMS, but talks about PWM.....ok, cool. So, my question is, does anyone know of a way I can SAFELY determine if there is in fact a BMS in these batteries? I did end up charging batt #2 using the charger, set on "Regular Battery" because the TalenCell website says the batteries can be charged using an SLO charger. If that is good for them....I dunno. Also, I connected the battery monitor.