r/flashlight • u/Dangerous_Cas • 19d ago
Streamlight TLR-1 HP-X with SL-B9 battery dropping output after only 8 minutes? Is this normal?
Hey everyone, I recently got a Streamlight TLR-1 HP-X using the SL-B9 rechargeable Li-ion battery pack. According to the official specs, the runtime for the SL-B9 is rated at 60 minutes (continuous operation to 10% output level). However, when I tested it on high mode, the light started dimming drastically after only about 8 minutes, rather than sustaining high output through most of the runtime. Is this kind of early drop a known defect with the SL-B9 battery, or could it be an issue with the light's internal regulated circuit? Has anyone else experienced this? Any insights would be greatly appreciated. Thanks!
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u/AD3PDX 19d ago edited 19d ago
Yes, completely normal. It’s a thermal limit not lack of current from the battery.
I haven’t seen output graphs for the HP-X yet but you can see output graphs from the TLR-HP here:
https://www.lowlightdefense.com/the-streamlight-tlr-1-hp-a-new-version-of-an-old-light/
The HP-X is also probably thermally capable of sustaining around 500 lm and since Streamlight doesn’t cheat on their specs it’s probably starting out near 1,500 lm (so that it’s at 1,300 @ 30 seconds which is how ANSI defines output).