Imren IMR review.
These blue IMR AA 3.7 volt rechargeable batteries replace the standard alkaline AA batteries in motorized Flywheel (usually) Nerf blasters if you use 2 spacers (place keepers/ conduits like Ultracell dummy batteries; sold separately) with them. You may need to take out the thermistor (thermal resistor in order for the device to work properly (as intended), and you need the right battery charger. I use a Nitecore D4, and these blue IMRs work just as well as the Red Efests of the same battery type. The spool up time of the motors is faster and the longevity of the charge is very good. Charge times tend to be a several hours long from start to finish even with the D4 charger, but since it lasts a long time I believe it is worth it.
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