Description
- Micro-USB charging port
- 3500mAh high capacity
- Protection circuitry to prevent short circuits
- Pressure vents to prevent explosions
- 500 charge cycles
- Voltage: 3.6V
- Charging Current: Recommended 1A, maximum 2A
- Charging Current USB Port: 0.8A
- Weight: 1.8 ounces (50.2g)
- Size: Length: 2.8″ (70mm) Diameter: 0.7″ (18.6mm)
- Warranty Period: 12 month from date of purchase
Ronald Holland (verified owner) –
No real experience with this battery yet. Good charge, although I’ll probably use the charger stand for faster times.
Ronnie (verified owner) –
Great battery and fast shipping
Joshua (verified owner) –
Awesome
Nicholas (verified owner) –
Great battery life. No issues with my tk20R
Robert H. (verified owner) –
Battery works as needed. Don’t like micro USB. Would like USB C connector.
Robert S. (verified owner) –
Works as described
Nathan (verified owner) –
Great battery life. Love the led indicator when charging!
Michael (verified owner) –
Great batteries too 👌
Wayne D. (verified owner) –
Charged easily and seems to really hold a charge.
Tom Berg (verified owner) –
I thought It would have come with charging cord.
Daniel Herndon (verified owner) –
The battery supplied steady power through the operating life of a full charge.
Amancio Ortega (verified owner) –
Very good battery
ROY Y. (verified owner) –
Excellent quality
George (verified owner) –
Quality battery that does the job.
stephen Moser (verified owner) –
good battery
Rande P. (verified owner) –
Batteries last longer on lower powers , easy to charge
Richard K. (verified owner) –
This battery holds a charge very well, and charges fast.
Michael Kaiser (verified owner) –
Purchased as a replacement and could not be happier. The built in USB charger allows me multiple charging options. I am not tied to an outlet anymore! I use my light quite a bit and this battery holds the charge.
Douglas Meyers (verified owner) –
Perfect performance.
David C. (verified owner) –
Like the built in charging port.
Andrew Woodson (verified owner) –
Doesnt hold a charge very disappointed
Dianne_G –
Sorry to hear that – I will have someone from our warranty department contact you.
Carmen M. (verified owner) –
High quality product
Douglas Stewart (verified owner) –
Very strong battery that charges quickly
Lawrence Thompson (verified owner) –
This very convenient unit was a big improvement over the previous model.
peter H. (verified owner) –
great batteries
Ryan (verified owner) –
Love how easy this is to charge
Robert (verified owner) –
Incredible flashlight. Extremely bright and nice to have the different levels of brightness. I probably should have opted for both instead of one, to have the rechargeable feature but i’ll just use the rechargeable one to charge both batteries. It’s amazing for such a small flashlight to have the power it has.
Anonymous (verified owner) –
Never realized I could be so impressed with a battery. This thing is solid.
TORREY (verified owner) –
A month later I haven’t had to recharge.. Carry it every day.
Peter H. (verified owner) –
great product like usual from Fenix
Joel (verified owner) –
Battery lasts long per charge, super convenient, way better than continuously buying non rechargeable batteries.
Anonymous (verified owner) –
I have charged these batteries without a problem but, honestly, I’m still using the 2600mAh that I’ve been using for a few years now so I really cannot review this battery yet. I use my Fenix UC35 on the lower brightness settings maybe 80% of the time, so the batteries LAST quite a while. I do expect the 3500mAh to last a ridiculously long time.
DAVID GATES (verified owner) –
excellent design
Joel T. (verified owner) –
Outstanding battery! Well worth the price.
Gary Schafer (verified owner) –
Very nice tool.
jerry Martin (verified owner) –
Good to have
William W. (verified owner) –
Seems very solid and I feel is a safe battery. Holds its charge.
Christopher P. (verified owner) –
Great power.
Tim D. (verified owner) –
Seem to work very well – noidea yet on longevity . . .
Anonymous (verified owner) –
Excellent product!!
Brian Taylor (verified owner) –
High performance, and long lasting.
James Fleming MD (verified owner) –
Perfect back up power!
Dan (verified owner) –
Delivers plenty of power and holds its charge when not in use.
Jesse T. (verified owner) –
These batteries are awesome. Charging them with a USB cable makes them very convenient. I have 2 sets of these batteries now and have been using one set for more than a year in 2 different Fenix PD35TAC flashlights. The PD35TAC and these batteries are my everyday carry for work. I can say with 100% confidence, that if you purchased a Fenix PD35TAC and these Fenix batteries, you will be very happy with their reliability and performance.
Anthony Bejarano (verified owner) –
Very handy charging.
Cody Pedersen (verified owner) –
Lasts a long time. Charges at a decent rate.
Dick Hines (verified owner) –
Time will tell if the charging port is durable. So far I have no complaint.
Shelly-Ann Bazil (verified owner) –
My husband needed rechargeable batteries, so i purchased this to try and it is working great for him. He uses his torchlight daily for work. I bought 1 battery for me and 2 batteries for him, so he always has a fully charged backup, and all is going well, so do hope it stays that way.
Aaron (verified owner) –
love the built in charging capabilities.
Brent (verified owner) –
Easy to charge last super long.
Jerry Robbins (verified owner) –
I love the USB charging port on these batteries. I also own 4 PD 35 Tactical lights, and 2 HL60R Headlights equipped with these batteries. Fenix is by far the best lights I’ve ever used. Thanks.
Marjorie (verified owner) –
Great battery, holds a long charge and recharging is fast. Very high quality, reliable products that do what they advertise. Thanks Fenix!
Anonymous (verified owner) –
A long lasting easy to charge battery for a reasonable price.
Raymond Dunlap (verified owner) –
Good Battery
Gregory G. (verified owner) –
Batteries are great
Bryan H. (verified owner) –
Works great, love the optional charging port.
Stan Portis (verified owner) –
These batteries are amazing
Michael Sebo (verified owner) –
Very convenient to charge and use in place of store bought lithium batteries, and less expensive overall! A great investment for your flashlight.
MICHAEL L. (verified owner) –
Easy to charge and lasts as expected. Time will tell if I get the full number of charges but so far so good.
Charles (verified owner) –
Excellent product
Dakota (verified owner) –
Fenix’s best battery. It runs all my 18650 Fenix lights
Jose G. (verified owner) –
excellent long lasting
Kevin (verified owner) –
Convenient to plug in directly.
Curtis (verified owner) –
Easy to use and to charge. Holds a long charge. I use it everyday!
Ryan (verified owner) –
Happy with the battery life so far. Can’t speak on how long the battery itself will last as I have only charged it about 3 times.
Stephen (verified owner) –
This Batt. will give you a little bit more run time than the one that comes with the light .When your running low just remove the 2900 mah batt. and put this one in and let there be more light .
Robert (verified owner) –
Great feature, very easy to recharge
Donna M. (verified owner) –
Like having a rechargeable bsttery
Al C. (verified owner) –
Sturdy battery. Love the charging port built into the battery itself. You won’t have to pack a separate charger. The battery also has a light that tells you when it’s charging and when it’s charged. What more can you ask for?
Jeffrey S. (verified owner) –
Love the ability to recharge.
Guy (verified owner) –
Great runtime.
Dave B. (verified owner) –
This battery has worked great for me so far! We went on vacation and I’m the only one who carries a flashlight, so it saw a *lot* of use over the week and a half we were in the mountains. I’ve been using it in the PD35, at all levels of brightness, and it hasn’t needed recharged yet.
Anonymous (verified owner) –
Great capacity and great convenience, 3500 mAH and an USB charging port are the perfect combination.
Cornelia U. (verified owner) –
lasts a long time
Dan B. (verified owner) –
These are great batteries. The run times in both the HP25R and HL60R are outstanding. Having the ability to recharge outside of the lamps allows me to top off multiple batteries at one time without a dedicated charger. The only issue I have had with these is one burned out when I accidentally plugged it into my cell phones quick charger. These batteries are pretty long, but will also work with some of the Zebra lights as well.
William W. (verified owner) –
Seems to hold charge well.
Clinton S. (verified owner) –
Lasts forever
Anonymous (verified owner) –
These batteries are very high quality and last for quite a while. Despite their high capacity, they charge much faster than expected. The many battery protection features are also a plus.
Chuck H. (verified owner) –
These batteries can’t be beat by any other brand, period! I have bought many different brands to try and get by without spending the money, but don’t even try the others out, they can’t compare.
David Chamberlain (verified owner) –
Strong, reliable and with options. Great battery.
Timothy (verified owner) –
Excellent battery to keep your Headlamp and flashlights bright!
Stephen (verified owner) –
Fast shipping
P. David Myerowitz (verified owner) –
Seem to work so far.
Anonymous (verified owner) –
Holds a long charge. Easy to recharge.
Aaron S. (verified owner) –
I keep,a couple lights in our emergency bags, so was looking for the longest run times. The 3500U is just what I needed. love the USB port right in the battery! I can charge it at home, work or in the car. Thank you for a great product and the accessories to support it!
Chris B. (verified owner) –
Charging the battery is a breeze with the built in charging port.
Brandon (verified owner) –
Great battery with long life and easy charging!
Thomas (verified owner) –
Cost effective and reusable. Everyone who can should switch to the environmental friendliness of rechargeable power.
Mark O. (verified owner) –
Love the durability and the ease of charging them.
Gary J. M. (verified owner) –
I love the ability to charge this battery with only a usb cable directly to the battery.
Anonymous (verified owner) –
Very good
Johnson (verified owner) –
Battery is ok. Fenix could have provided the usb charging cable.
Anonymous (verified owner) –
So far so good.
John (verified owner) –
Great product, got 2 for back-up. Very satisfied.
Anonymous (verified owner) –
This battery works very well – easy to charge and it has a long life. My preference is the 3500 size instead of ones with less capacity. The “U” here seems to stand for the ability to charge the battery directly without a charger. Seems to charge faster with the charger. Great product.
Paul Carroll (verified owner) –
Great little battery. Outstanding job!
Thomas –
These batteries are truly great. The usb port makes charging them very easy, as everyone has a charger or three. They exhibit a very long run time. I have been using them for a while now and have had no problems.
Josh bess –
This battery is beyond amazing, I have been messing with 18650’s for over 4 years now and this thing is almost impossible to drain. I can use it for weeks with my pd32 on high & turbo mode for a few minutes (give or take) or so a day, at work, at home, or just whenever needed, and every time I throw it on the charger to see how much it has drained – I have never seen it below 4.05V. This thing is simply a monster. As everyone knows though, you get what you pay for! The added micro usb port, and extra Mah is a HUGE plus! I dont see how 18650s could get much better than this one. Dont think…just BUY! : )
Josh bess –
This battery is beyond amazing, I have been using 18650’s for over 4 years now for all sorts of things and this one seems almost impossible to drain. The cutoff voltage is 4.2V. & I can literally use it for weeks in my pd32 on high & turbo mode for 5 minutes (give or take) or so a day, at work or at home or just whenever needed, and every time I throw it on the charger to see how much it has drained – it never has been below 4.05V. This thing is simply a monster. As everyone knows though, you get what you pay for! Not to mention the added micro Usb port and extra Mah is a Huge Plus! I just simply don’t see how 18650’s could get any better than this one when it comes to Fenix tactical flashlights. Dont think…just BUY! : )
Gloria –
Bought the PD35 tactical flashlight and the battery charger. I had a PD35 with the 3400 battery already. To my surprise the tactical came with a 3500 battery. I swapped batteries, put the 3500 battery in my PD35 and vis-versa both lights now have the same top brightness. So if you already have the PD35 with a 3400 battery… upgrade the battery, it will blow you away
Hannah De Vries –
Hi Al, our customer service has not received any emails from you. Please email customerservice@fenixlighting.com or call the number on our home page and ask for Blake. Thank you!
Shaun –
Haven’t baught one yet, but I’m glad they went to a 3500 mAh capacity, also like that it has a fully charged light. Looks like a great battery.