1000pcs WAY-ON LN350 LN350SLL 3.50A hold, 9.0A trip, 6VDC max PTC Resettable Fuse Strap for Battery $0.05/pc

Features: Lower power consumption by lower resistance, The miniaturized PTC elements leads a flexible design around battery, Typical used for protection of Li-ion/ Polymer Li-ion battery, Lead-free, Halogen free, Agency recognition: UL、CSA、TUV. 

IH=3.5A Hold current: maximum current at which the device will not trip at 25℃ still air.

IT=9.0A Trip current: minimum current at which the device will always trip at 25℃ still air.

Vmax=6V Maximum voltage device can withstand without damage at rated current.

Imax=17.5A Maximum fault current device can withstand without damage at rated voltage. 

Max Time-to-trip=2.0S Maximum time to trip(s) at assigned current.

Pd max=MAX1.3 Maximum power dissipation: maximum power dissipated by the device when in state air environment.

Rmin=0.004 Minimum device resistance at 25℃ prior to tripping.

Rmax=0.010 Maximum device resistance at 25℃ prior to tripping.

R1max=0.020 Maximum device resistance at 25℃, of device one hour after being tripped the first time.

1000pcs way-on Polymer PTC Resettable Fuse LN350 LN350SLL $0.05/pc 

Pictures from real stock.
Item location: China.
The buyer pays the shipping.