Magicshine Bike Light Battery MJ-6112, 6116, 6116C, 6118 USB Rechargeable Battery Pack for MJ-900/906, Monteer Series MTB Lights, 7.2V High Capacity Li-Ion Battery Pack (6112 (2600mAh))

No issue. Charges easily.

I'm not shown as a verified purchaser because I didn't buy my MJ-6112 as a separate item. Instead, I recently bought a Magicshine MJ-900 from Amazon that came with the MJ-6112 battery.The battery was DOA. Specifically, the battery appeared to accept a full charge as per its LED display. However, none of the LEDs would then light up when the test button was pushed, and no light was produced after the headlamp was plugged in. In other words, the battery was completely dead after a full charge.I contacted Magicshine immediately by email. Despite some initial nice noises, I never received a replacement battery under the warranty. I had to return the entire MJ-900 product to Amazon before the 30 day return window closed.In my opinion, there is no clearer example of a warranty issue than a brand new battery that won't work following its first full charge. My particular problem may be unique to the MJ-6112 battery and not applicable to the other three battery models. But Magicshine's warranty service will cut across its entire product line. This was my first and last Magicshine purchase.