3*21700 customized rechargeable battery pack

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TrustFire2021
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3*21700 customized rechargeable battery pack

TrustFire DF50 is a diving flashlight specially designed for scuba diving, cave diving, free diving and other underwater sports lighting.

The three light sources are: ultraviolet light, red light, and white light, which can meet different needs. up to 150 degrees flooding can provide 6500 lumens of underwater lighting.

Using 3pcs 21700 3.7V 5000mAh customized rechargeable battery pack.

Do you like it? Do you want to get more details?please click it:

https://ebay.to/2U6hwbO

Edited by: TrustFire2021 on 06/25/2021 - 05:01
Lux-Perpetua
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First of all, a warm welcome to BLF, TrustFire2021! Have a great time over here. Smile

Lately, I was given the opportunity from Jacob (TrustFire Deutschland) to testing some of your new models, such as T1R, MC3, MC1, MC12, .... I hope to presenting my feedback anytime soon.

 

One little request:

May I ask you to create / move any commercially related threads of yours into the "commercial sellers spot" subforum?

https://budgetlightforum.com/forum/marketplace/commercial

This is part of the rules here on BLF. Thanks a lot for your understanding.

 

Some feedback concerning the DF50 model:

Quote:

Using 3pcs 21700 3.7V 5000mAh customized rechargeable battery pack.

...

USE good quality ARB5000U battery pack   :
Capacity: 5000mAh
Voltage: 11.1V
Battery pack power: 55.5WH
with Type-C charging port
with Charging indicator:red light means charging, Green light means full charge.

Type-C charging parameters: A. Voltage input range: 3-22V B. Support charging protocol: PD2.0/PD3.0/PPS/
C. Charger voltage recognition: 20V/15V/12V/9V/5V
Maximum charging power : (input)-22V/3.5A; (output)-22V/3A

Battery pack protection functions:
A. Over current protection B. Over discharge protection C. Over charged protection D. 0V battery can be repaired
 
Battery selection for battery pack:
Rechargeable lithium-ion battery with protection board (Trustfire-battery pack series and so on)
3*21700mAh(3.6V/3.7V)

I really appreciate that you support PowerDelivery with PPS and up to 20V 3A (= 60W input power!). Not sure if those 22V are still within the specs of PD, though. Anyway, that's quite a lot of power to recharge three 21700 batteries. If my calculations are correct it is very close to a translation of 5V 4A per battery. Maybe others can join in and tell about their thoughts. For a long life cycle of the battery pack it is maybe better to use a lower input power of 36W.

Is the battery pack an integrated entity, i.e. can customers exchange those batteries in the battery pack themselves or would we need to buy a new battery pack from TrustFire if the pack is broken or worn out? In the latter case I must admit, I would not support this idea. I would encourage you to offer the option to run DF50 with replaceable standard 21700 batteries.

 

Quote:

There are 4 different LEDs creating 3 different color beam light
6*XM2 U3 lamp beads, white light (flooding) color temperature 6000K, up to 150 degrees flooding can provide 6500 lumens of underwater lighting.
3* XE-3535 red LEDs, 620nm wavelength, provide pure and efficient red light, suitable for underwater photography, creative photography fill light and red light-insensitive fish fill light.
3*XPU UV LEDs with a wavelength of 395nm and pure UV light, suitable for underwater photography of fish and corals with fluorescent substances, more suitable for creative photography fill light.

 

XM2 means probably Cree XM-L2? 6000K is okay but for underwater lighting I would highly recommend looking for warmer tints with a higher proportion of red light in the visible spectrum, i.e. 4000K - 5000K. Maybe you can try using Luminus SST40 5000K (same 5050 XML footprint) or maybe Cree XM-L2 or XM-L3 in some warmer tints? Best would be using an emitter with high color rendition ("HighCRI") of 80 or 90 CRI.

XE-3535 red LEDs are probably Cree XP-E(2) red LEDs? That's alright. On BLF there are some interesting discussions about deep red light (650nm and beyond) and its biochemical effects on the human eye. Maybe deep red lighting could be useful for underwater applications, too.

 

The user interface...

Quote:

on/off:
Under unlocked mode,long press the side switch for 0.5 seconds to turn on/off

Most people on BLF/TLF prefer a single click to turn on/off.

Quote:

Switch working mode
When flashlight is ON, click the side switch to change modes from violet light mode →red light mode→high mode→low mode

There's some potential for improving that mode order. Being forced to cycle through all lighting modes is not very user-friendly.

My proposal:

When the flashlight is ON, hold the side switch to change brightness between low mode (default) and high mode

When the flashlight is ON, doubleclick to cycle to the next mode group: white light (default) - red light - ultraviolet light

Quote:

SOS mode:
When the flashlight is OFF, long press the switch for 2 seconds to enter into SOS mode , click the switch to return to the working mode.

My proposal:
When the flashlight is OFF or ON, triple-click the switch to enter into SOS mode, another triple-click to return to standard mode, single-click again to turn OFF.

Quote:

Memory mode:
Flashlight will memorize the last time working mode automatically before it turn off. And go to the last time working mode for next turn on.

I do not recommend this on lights using ultraviolet light. There is a potential risk of injuring one's eyes if the light is turned off and on again after using the UV mode. I would rather recommend using mode memory not at all or  restricted to white and red light only.

Quote:

Accidentally touch prevention【lock/unlock】:
◎Lock: When flashlight is off , double-click quickly switch into lock mode, it will flash twice in low light and locked.
◎Unlock: When flashlight is locked mode, double-click quickly to unlock and switch into the working mode.

Double-click from OFF is in 99% of all flashlights used for triggering the turbo/maximum brightness mode.

My proposal:

4 fast clicks from OFF to (de-)activate the electronic lockout.

While locked, hold the switch temporarily to use moonlight (very dim brightness mode)

 

Lightbringer
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Yeah, a lotta people will refuse to buy a light just because of a “nonstandard” UI.

Press’n‘hold from off should go to lowest mode, 2click to turbo, maybe 3click for blinkies, and that’s it.

For nonstandard functions (eg, switching emitters) sure, your own way of doing that would be fine.

And 6500K is so 3-years-ago.

 

Gotta ask, though. What’s that doodad hanging off the light? I see those a lot on diving lights, don’t recall hearing any mention of what it does.

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TrustFire2021
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Hello,This is the “ball joint” for easy mounting to any-camera system such as Xiaoyi, Gopro, action cameras and DSLR camera. the joint can be easily installed for camera system an easily uninstanlled for handheld use.

TrustFire2021
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thanks for your advice.