Hello, I have an old block rocker portable speaker made by Ion. It used to run on a 6V SLA battery of 7Ah capacity, and contained a 240V transformer with internal charge circuitry.
The sound was never very good so I have modified the drivers. This has required gutting the existing circuitry and putting new class D amplifiers. The new circuits run on 12V.
I have been looking at 12V LiFePo4 packs of approx 10Ah. The battery should fit nicely, and will hopefully add additional run time. I will add a DC jack on the rear of the cabinet and have a 12V PSU (like a laptop) that will be able to charge the new battery.
However: I am not sure how to go about charging this… I have found conflicting information that says you can charge LiFePo4s with Lead Acid chargers… I am not so sure this is correct.
Am I right in thinking that to a certain extent, these batteries have BMS’s in them, so a lot of the hard work is already done- I just need to find some charging circuitry that will apply 12V to the battery and cut off at a certain point?
I was looking at something like this: ￡10.20 18％ Off | 5A 18V MPPT Solar Charge Controller 3S 4S Lithium Li-ion LiFePO4 Battery Charging Board
Or this: ￡1.23 4％ Off | 2-in-1 1A 3.7V 3.8V 7.4V 11.1V 14.8V 18.5V Lithium ion LiFePO4 Titanate Battery Charger Charging Board DC-DC Buck Converter
Has anyone used these before? Are they suitable? Any and all help appreciated!