INTSUN 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc

Purchased for occasionally used flashlight. Unimpressed with the 72 hr. Charge. Charger requires both batteries installed in order to charge. Went to use 2nd battery for first time after initial test 57 days after receiving, it is completely dead, will not charge, nor can the charger recharge the other okay battery. Can't return/refund after 30 days. Tired of wasting money on useless Chinese garbage.***UPDATE***E-mailed Intsun requesting replacement battery, they responded by offering me a $6 reimbursement, I accepted via an Amazon click on link, but never received a $6 deposit OR credit. This is now the 2nd Chinese Co. to use this tactic through Amazon.

Not only did the charger prove to be defective but after writing them that after charging overnight the red charging light was still on, the seller suggested I need to test their charger with some other 18650 batteries than the ones that came with this P.O.S. in order to troubleshoot the problem. What??? Returned for a refund!

Charges 2 3.7 flashlight batteries at once. Done quickly and seem to become fully charged in a few hours. I use it for 12 hours, then take out batteries and charger out of wall. These batteries may explode if heated or overcharged. You will see a warning on package of any Li-ion Battery that gets shipped, NOT to be flown in an airplane. Over all, nice charger for the price!

These batteries saved my weekend of fun. Replaced some garbage brand that came with the flashlight. Like how you can see the charger status.

These things hold a charge for a long time! I accidentally sent one of them through the laundry, and it still works. I would not recommend trying that, though. It was a cold water only cycle, and I found it before it went into the dryer. So there's that.

These batteries work fantastic

Only one of two batteries works. Of course I didn't test both of them and I'm outside the return window. Would give one start but the second battery works and they last forever so they get two stars.

Works as promised. Haven't had to recharge my home defense light in months and I play with the light frequently becuse it's so bright.