2S-8S BMS for 18650

[SAN CHAN]

Please Guide me.

I have many 18650 cells which I want to test with IMAX Charger/Discharger. While Charging and specifically to test the mAh/power while discharging I have to connect a single cell. It is time consuming and I have to be attentive.

To overcome this problem, I bought a black colour- simple battery holder for 4nos. 18650 cells, XT60 connector pair, 4S cable, 14AWG wire. I plan to creat a Lipo-type charging connection and balance cable connection. It will help me not only to simultaniously charge 4 cells but would be useful for Discharge, Balancing purpose. My questions are :

1) Am I correct in this thinking or is it unusable?

2) DO I NEED A BMS OF 4S TO COMPLETE THE CIRCUIT OR DIRECT CONNECTIONS TO IMAX CHARGER WITHOUT BMS IS OK?

Please answer these quiestions. Any experienced suggestion is greatly appreciated.

[Mad Mike]

@San Chan, I would recommend you go ahead and buy something like the liitokala units to test your batteries. they will give you the Capacity, and internal resistance of your batteries.

[Gerlach]

@Mad Mike are you in to the lithium diy game? 

[Richard Mackay]

1 hour ago, Mad Mike said:

@San Chan, I would recommend you go ahead and buy something like the liitokala units to test your batteries. they will give you the Capacity, and internal resistance of your batteries.

Anyone selling these locally?

[ibiza]

2 hours ago, Richard Mackay said:

Anyone selling these locally?

I bought one on Bid or buy from capetonian  supplier but was very unhappy. Tester broke after one week and supplier asked me to sen it back at my cost which I found unfair so, turned to banggood and am very happy with their overall service and recommending  them warmley.. competitive price, good aftersale service, vert fast delivery...

[Mad Mike]

15 hours ago, Gerlach said:

@Mad Mike are you in to the lithium diy game? 

Just a wee bit! I have a sweet19kWh powerwall up and running a small 3kWh power wall on the way for the other inverter. Don't tell the others (I am shooting for 50kWh), they think I am crazy by building a fireball in waiting!

[Mad Mike]

13 hours ago, Richard Mackay said:

Anyone selling these locally?

I tried a local supplier early on and was massively disappointed as the items were fakes and died within days. I bought mine from china and have no complaints, the 4 units have tested just over 4500 cells between them. They are now showing their age, buttons not responding,  afew bays are temperamental!! I have ordered new ones from China again and if the post office staff don't liberate them from me prematurely I should have them some time in January 2020.