What's your definition of LVP failing? What was the end voltage?
How old are your Eneloop Pros? Have any regular Eneloops to test with?
It's pretty well known that Eneloop Pros don't have nearly as many cycles as regular Eneloops and thus die (high internal resistance) much quicker.
I've recycled all my Energizer high capacity NiMH but still have all my regular Eneloops that are now 8 years old. All still measure under 25mΩ (AC IR test).
Running Li-ion down to 1.58v and running Eneloop to .84v to the point LED is at very low output and doing a flicker flash unable to maintain a low level output and still eating at the battery.
Eneloop Pro and Fijitsu (Fijitsu never used and 1 year old) are low-useage and both cycled to above 2500 mah and ready for prime time. Eneloop whites cycled to 1400mah so I didn't try them. The driver for the SC53 is in the 60% range which is terrible vs 90% for others so didn't expect huge run-times...
I documented all the step-down times and such for each battery but it's allot to compile. I want to run couple more test also and I need to be present to catch the low flicker flash when voltage gets too low.
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I thought for sure SC53 had LVP and RVP but was aware it might not.
Exchange between thefreeman/m4potofu and mcbob:
thefreeman/m4potofu is a French guy that test and builds drivers:
m4potofu 1 yr. ago
I have several modded SC53/H53s here and they work fine on 14500 without getting too hot even with an inefficient LED like 219B. H1 on li-ion has a 60 second stepdown, so in theory you could keep resetting it, but the light would get too hot to hold before the driver acts up.
Yeah I tested it without heatsinking and the driver itself needs to dissipate nearly 3W on H1 with Vin=4V, that's a lot of power, but maybe ok for 60s in the flashlight, the flickering is likely due to the boost IC thermal protection (same behavior with other ICs I used).
Well, it's not turning off, no step down either, maybe the firmware changed, mine is recent.
Zebralight claims the H53/SC53 have RVP, but well...
There is no RPP PFET unlike their non AA models, batt+ is directly connected to the inductor, min voltage for the boost IC is -0.3V so... yeah that's not true ZL...
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Only run that acted correctly Vapcell H10 ending at 2.98v. Stepping down to lower levels with around 7hr total runtime... Red check marks you can see some step-downs...