do they have EH on the side of the battery also does it say IMR 18650? if so, then this may help, i got it of the EH website. (EHfire.com)
Chinese company. If you go to the website type in the info on the side of the battery if it is an EH battery the pic will come up with a link and info on the battery. if the battery is a IMR type battery then no it is not protected. I top off my battery each night and take it off the charger as soon as the light turns green. This is to keep it from overcharging. All batteries that are not protected need to be pulled from the charger once the light is green. Do charge the battery before they drop below 2.5V if you don't then it could ruin your battery in the long run. Please someone correct me if i am interpreting the info below incorrectly.
(IMR is the type of material)
EH 18650 2000mah 3.7V button top battery (Pro/ZMax/GGTS mod/Variable Volt 808 Gripper )
These LiMn batteries have a safe chemistry meaning no risk of venting with flame or explosion. Ideal for use in multiple cell applications.
Brand : EH (Only from our ehome company )
PCS: 2 PCS
Spec: Lithium 18650-2000mAh 3.7V
Material: IMR
Size(mm):64.88(L)*18.25(D)
Specifications:
Nominal Voltage :3.7V
Voltage at end of Dischargr:2.5V
Rated Capacity : Typical (2000mah)
Cycle Life :>500cycle
Operation Temperature Range :Charge(0~45℃ ) Discharge(-10~60℃ )
Welcome OEM!!
Note:
*Use a a Li-Ion charger. Do not use a NiMh charger.
*To ensure longevity, it is not recommended to allow the battery to discharge below 2.5V.
*Do discharged below 2.5 volts or cycle life/performance will be reduced. Maximum charge voltage is 4.25 volts.
*Chemical composition is lithium manganese oxide
*4.2V max charge, 3.7V nominal charge
*Safer chemistry, so is not available with a protection circuit. But that means you must guard against overcharge and overdischarge themselves.