Quality around 50$

[ryansoh3]

@Phil

• Are there any added dangers I should know about?

Yeah, li-ions tend to be picky about the way they’re charged and handled, and often come with protection circuits to prevent dangerous thing from happening.

The Sky Ray King does take 4x 18650 li-ion batteries, so that’s going to add about 20-40 extra dollars depending on which cells you get as well as the charger.

They pack a lot of energy compared to other rechargeable batteries such as Ni-MH, but require a lot more attention.

Here’s a great write-up by scaru about li-ion cells and their safety: Li-ion Battery Safety and Shopping Guide

LiCo/LiMn cells are the most dangerous kinds of Li-ion battery. They have and can explode if not treated with respect and care.

First of all, when using them in multi-cell lights make sure they are the same voltage. This means you will need to have a DMM and check the voltage before you load them in the flashlight. This is important because as they discharge if one is at 3.6 volts and the other is at 0 then the one at 0 can get reverse charged. This is how they explode.

Continuing in the mission to prevent reverse charging, one must use cells of the same capacity. This means all of the cells must be identical, and matched to each other. A few notes about this: xxxxfire cells are not considered identical and a cell that has been used a lot is not identical to an unused cell.

Not to disappoint or disrespect you, but if you’re not ready to handle/harness the power of li-ions, please be careful and make right choices. We’re always here to help, so don’t hesitate to ask questions.

Good luck!