Dell Inspiron 6400 battery Description 

Type:  Li-ion
Capacity:  4400 mAh/6600mah
Volt:  11.1 V 
Size:  209.50 x 72.40 x 23.30 mm
Color:  Black 
Dell Inspiron 6400 battery Compatible original Battery Code:

0GD761
0KD476
0PD942
0PD945
0PD946
0RD850
0RD857
0RD859
0TD344
0TD347
0TD349
0UD260
0UD264
0UD265
0UD267
451-10338
CR174
HJ588
HJ607
HK421
JN149
MJ365
NR147
PY961
TM777
TM787
TM795
TX280
UY628
XU863
XU882
312-0427
312-0428
312-0460
312-0461
312-0466
312-0467
312-0599
312-0600
451-10339
451-10424
451-10482
GD761
KD476
PD942
PD945
PD946
PR002
RD850
RD855
RD857
RD859
TD344
TD347
TD349
UD260
UD264
UD265
UD267
XU937

Dell 6400 battery Fit with below:

Inspiron 1501
Inspiron 6400
Inspiron E1501
Inspiron E1505
Latitude 131L
Vostro 1000