help:want a schematic of charging 4 li-ion or liPo battery series

[maxyeah]

since li+ batteries have greater energy density, are good for using as protable amps' power supply.But keeping safe and charging are always headache to me . Do someone have some good and simple circuits on it?

 

[MisterX]

Simple Li+ chargers are a bit of an oxymoron, especially when you are talking about charging a 4s pack.
Here is an example--------> http://datasheets.maxim-ic.com/en/ds/MAX1758.pdf

Edit:
If you have any doubt about LiPo fires you may want to check out any of the videos from the link below:

YouTube - Broadcast Yourself.

 

[error401]

The BQ2954 datasheet includes a schematic for a 1-4 cell Li-Ion charger on page 5.