A lot of people have to disconnect their batteries and than charge them one at the time… That takes alot of time so there is a solution; BMS
I used pictures from this video: https://www.youtube.com/watch?v=jxHQjlHv1y4
So first you have to choose the right bms for your battery. I have 2x 3s 5Ah Li-po batteries in series so I would need a 6s 5A BMS
Like this one;
BMS has an over-current feature but we are going to bypass that because our boards can draw much more and the cut-off voltage feature is integrated in the most of escs
When choosing for a bms, look that it has the balance charging.
This would be a diagram for a 6s battery
Output is directly from the battery and not from the drain of the bms because over-current feature.
In the description of the bms you can find all of the information…
Now that you have that, you need a charger.
Now, look at the maximum charging current on your batteries. On mine it is 2C so that’s 10A, but slower charging is safer.
On the discription of the bms you have the charging voltage, on this one is 27-30V but it work’s with 25.2V and that is the maximum 6s Li-po/Li-ion voltage
You can buy a charger like this one https://www.ebay.com/itm/25-2V-2A-Smart-Charger-For-21-6V-22-2V-25-2V-Li-ion-Li-Po-Lithium-Battery-US-Plu/112630200819?hash=item1a394879f3:g:YN8AAOSwT2daB~kW&vxp=mtr
It even has the led that let’s you know when the batteries are charger charged… But charging with that would take alot of time so I built mine own charger.
First you need a power supply… I bought 24V 120W power supply from ebay.
It can go up to 5A but the standard voltage is 24V and we need 25.2V So we need to limit the current.
On 24V 5A 120W model you have to solder a 10K ohm potentiometer to R35 resistor
Now you can set it to 25.2V and about 4.7A in my case.
When charging like this, you can’t tell when batteries are done charging so you would need to add an ammeter to it, when it’s about 0, it’s done charging.
