Electronics Charger for 4x3.7V li-ion batteries?

Hi.

I going to have 4x3.7V(=14.8V) li-ion batteries connected in serial and built inside a box, and I want to be able to recharge these.

Would something like this work?

The cells are 4900 mAh each

 

Should be fine. Just make sure you ALWAYS use a battery management protective circuit and wire the charging circuit to it if you haven't already. You don't want anything blowing up.

 

It will work fine. I recommend finding old laptop battery with same voltage value and using circuit of that battery,

 

Here are the specs of the batteries I've got:

Voltage:3.7V
Capacity:4900mAh
Rechargeable battery with PCB
High rate discharge,no memory effect
Short circuit,over charge and discharge protection
PCB life is around 10 years
It is green

It says it has protective PCB... I bought them cheap on Ebay though. Should I consider another circuit?

 

A lot of the time those cheap ebay ones can be okay. The Protective circuits however, can be a bit dodgy. Despite being from the UK, i've found www.batteryspace.com to be the best site around.

 

Could be worth spending some extra $s for safety reasons here I guess. Thanx Wisdom!

 

That's the truth. In a portable console/computer, the worst thing to go is the batteries. They could take your whole project with them!