Nitecore UM4 Battery Charger: Review

A look at the new UM4 charger from Nitecore. This range is powered via USB – with a micro USB port, but also offers quick charge compatiblity for higher voltage, allowing more amps 3.0 v 2.0 on a normal USB output.

I take an in depth look at the charger to see how it performs

Sample supplied via Nitecore for unbiased testing and review
Details from the maker:

Input DC 5V/2A 9V/2A
18W (MAX)
Output voltage 4.35V±1% / 4.2V±1% / 3.7V±1% / 1.48V±1%
Output current QC Mode: 1,500mA*1 (MAX), 1,500mA*2 (MAX), 750mA*4 (MAX)
Standard Mode: 1,500mA*1 (MAX), 1,000mA*2 (MAX), 500mA*4 (MAX)
Compatible with IMR/Li-ion/LiFePO4: 10440, 14500, 14650, 16500, 16340(RCR123), 16650,
17350, 17500, 17650, 17670, 17700, 18350, 18490,
18500, 18650, 18700, 20700, 21700, 22500, 22650,
25500, 26500, 26650, 26700
Ni-MH/Ni-Cd: AA, AAA, AAAA, C, D


Xtar VC4 Charger: Review & Test

Xtar VC4 Gearbest –
An in depth look at the popular multi format charger from Xtar the VC4. This charger is USB powered and have an informative display showing the charging voltage of the cells, and mAh charge a cell has taken (which can if it’s discharged give an indication of battery capacity)

How does the Xtar perform and what are the advantages/disadvantages of this particular charger?

Details from the maker:
XTAR VC4 is the combination of our principle to keep making progress and taking the responsibility for the safety and environment protection. The VC4 can recognize/ display/ charge Ni-MH and Li-ion batteries at the same time and it also displays the charging current, battery voltage and charging capacity. The LCD backlight can be off or automatically into low light mode in 2min to save more energy.

Input Power: DC 5.0V 2.1A
0.5A CC Current: 500±50m A
1.0A CC Current: 1000±80m A
Cut-off Voltage:4.20±0.05V
Operation Temperature:0-40℃

Ni-MH batteries charging parameter:
Input Power:DC 5.0V 2.1A
0.5A Pulse Charging Current: 500±50 mA
1.0A Pulse Charging Current: 1000±80 mA
Cut-off Voltage: 1.45±0.1V
Operation Temperature: 0-40℃
Size 149x115x35mm
Weight 210g

Package included:
1x VC4 Charger
1x USB Cable
1x Storage Pouch
1x Manual


XTAR VC2 USB LCD Li-ion Battery Charger (Unboxing and Testing)

XTAR VC2 USB LCD Li-ion Battery Charger (Unboxing and Testing)

Unboxing and Testing XTAR VC2 USB LCD Li-ion Battery Charger With WITH 16340 LI-ION BATTERIESes.
XTAR VC2 USB LCD Li-ion Battery Charger shows only charged capacity.

Track: Paul Flint & Phil Lees – Girlfriend (ft. LW) [NCS Release]
Music provided by NoCopyrightSounds.
Free Download / Stream:

Thank you for watching.

Products Explorer – Interesting information for you.

Please do not hesitate to contact us if you want to send any product for unboxing, review or testing.

Please subscribe, share, and stay tuned.

** Please visit and subscribe our YouTube channels **

Products Explorer
Products Explorer Subscription Program
M.T.J. Music
M.T.J. Show

** Please visit our Websites **

Products Explorer
How to …

All links to recommended YouTube channels and website are mentioned in about section.


Golisi S4 Smart Battery Charger

Golisi S4 Smart Battery Charger

Golisi S4 2.0A Smart Charger with LCD Display and Wall Charger Cable :

If you are shopping for electronic components, test gear or consumables please consider visiting my Amazon shop @

Please check out and pledge a dollar if you can. It will go a long way to keeping the channel alive. It costs a bit of money to buy all the items and produce these videos. You help is appriciated.

Or….if you’d like to send a one-time donation you can use this link:

Me: Paul, 49 from USA
Education: United States Navy, University of California at San Diego B.S. E.E., University of Pittsburgh M.S. E.E.
Experience: United States Navy STS, Bayer Intnl Process Engineer, C.C.A.C AP of EE
Current: Retired
Health: BAD (Congestive Heart Failure)
Hobbies: Electronics, flying, amateur radio, music (classic rock)

Low cost, professional PCB’s:


3.7V Smart Li-ion Battery Charger Using LM358N

Note : Description Available Soon


Simplest 18650 Li-ion battery charger that brings dead batteries to life using LM317


How to make 3.7 volt battery charger / how to charge 3.7 volt battery with mobile charger Hindi/Urdu

Hello friends in this video i explain how to make 3.7 volt battery charger or u can say how to charge 3.7 volt battery with mobile charger

#batterycharger #3.7voltbatterycharger #batterychargercircuit
Parts List :- Transister BC547
Resiste:- VR 10K , 1K, 220 OHM all 1/4w
Diode IN4007

Circuit Link :-


Review Tenergy Li-ion Battery charger 18650 14500

Inexpensive Li-ion battery charger for 18650 and 14500 Li-ion cells.


Banggood RC Giveaway – Two Aluminium Battery chargers up for grabs

Banggood Giveaway – Two 2-4S Li-poly/Li-ion Aluminium Battery chargers up for grabs. Details on how to enter are in this video and in the description below here, Good Luck to all participants.

NB. Only one entry permitted per subscriber please, multiple comments by a single subscriber will be deleted prior to the draw and possibly disqualified if you make too much extra work for me having to do this.

IMPORTANT UPDATE: The winners will also have the option to select this Battery Charger, if they would prefer this:


1. Click and visit this link: Cool-play week with extra 20%off:

2. Choose your favourite item available on this promotion.

3. Post what your favourite item is in the comments below this video.

4. Make sure that you are subscribed to this youtube channel.

That is all, hope you find this simple, easy & interesting to participate.

Two lucky winners will be selected by this Youtube Random Comment Picker in a live draw on this youtube channel at 20h00 GMT on Wednesday 22 August.

If you are one of the lucky winners then, please email these details to :
Postal Address:
Post code:
Phone number:

and will send this directly to you.

Link to these prizes on offer here: :


Created by BillM – RC (alias). Please feel free to share this, but this is not to be reproduced or copied without express written consent by any person or organisation.



Twitter: @globalrcbill
Instagram: @billglobalrc

If you would like to see or share more RC related media, please join my Global RC Sharing (GRCS) group here:


Fenix ARE C1 Li ion Battery Charger Review

Click here to purchase:



Thank you for checking out my latest review on the Fenix ARE-C1 Li-ion battery charger. This is a very nice and versatile charger for recharging 18650 li-ion batteries. I use these cells in the BT20 bike light and they are also a nice substitute for those expensive CR123A cells.
The charger will charge batteries from dead to full in about 3.5 hours.
fenix are-c1 battery charger, best 18650 battery chargers, fenix 18650 battery charger review, fenix 18650 battery

Please leave your questions and comments below and I will get back to you as soon as I can.

Thanks for checking out my review and please subscribe to stay up to date on all the things I’m working on here at