3400mAh Battery Mod for the Eachine EV800D FPV Screen/Box Goggles

[@RagTheNutsOff]

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[@RagTheNutsOff]

Update: This has been a definite marked improvement. The 3400mAh batteries last for ever now and the field charging is a huge bonus. Believe it or not it's o my been recently that I have actually used a screen like this and I must admit, it's not bad at all! Hope the follow up helps. Matt

[@zorilla0]

I kept my solution simple. I bought a USB-to-2.5x0.7mm barrel connector cable for $2.50, cut the USB end off and replaced it with an XT60. When my internal goggles battery gets low in the field, I can just grab a random LiPo, put it in my back pocket, and plug it in. The charge port will take 11-20V, so 4S is totally fine. I did have to build a 1-foot extension since the even the longest cables for sale on eBay were still a little too short to reach my butt on their own. The EV800D's used to come with a 3S balance plug adapter (though mine didn't), so they kind of expected people to extend battery life in this way.

[@marcoplanas1]

I can put a lipo 4s directly to the charging port that does not break?

[@zorilla0]

@@marcoplanas1 Yes, even a storage charged 5S is technically fine (though I wouldn't risk it on the off chance it happens to be charged higher). You will need to keep an eye on your LiPos to make sure you don't over-discharge them. If the DC input on these goggles has a low voltage cutoff, it's going to be geared toward 3S only and will continue to draw power well below 14V.

[@alasdair4161]

Matt..warning.. that original battery has an internal BMS board that balances the two cells when charging, and it has LVC when empty to prevent over discharge. You can extract the board from the old battery to repurpose it, but I wouldn't recommend charging straight series. Also, the terminal charge voltage before that BMS may be half a volt higher at end of charge as the BMS clamps to 4.2..

[@RagTheNutsOff]

I'm not updating it. It'll be fine. They're li-on cells and will sort themselves out over time. Gotta be a good 100 uses in them or more before it could be a mild concern. Matt

[@hairygamer6630]

@@STK2008STK just mount the 18650's in a separate case, it will lighten the goggles and you can charge them on a regular charger. Also easier to change in the field if needed.

[@davisiepmann597]

Q1: "how are you charging two cells without balancer leads?" and Q2: "what kind of charger do you use with the xt60 connector?"

[@bobfin4291]

Great job MATT I did a same sort of mod two days ago . Q: how are you charging two cells without balancer leads please explain.

[@cabomful]

He can’t 🤣 I was wandering about the same question.. But my guess is that he don’t balance charge those batteries but just charge them normal.. not with the adapter that follow the Googles but with a balance charger, but don’t balance charge them.. just set the program on your charger to normal charge.. right #RagTheNutsOff ??😁

[@FifaInspected]

We have these goggles and use the 3S power adaptor cable that came with them. We typically connect a 2200 to it and we are all set for longer than we need.

[@AMARFPV]

Thats what i am doing as well. Do you think it would be possible to remove the battery all together this way, just to safe weight in front? I think it is, right?

[@SergyFPV]

@@AMARFPV some of my friends fpviste put battery outside behind head or on side for a better balance and no problem for recharge it with balance leads in plus !

[@austinpnov]

@@AMARFPV I removed mine an an made its external 5200 mah 2s lol

[@hairygamer6630]

So just to be sure, the charging circuit is 3s and if we unplug the 2s battery we can run the goggles off just the charging circuit using a 3s battery?

[@Tom509]

What is the connector for the original ev800d battery called? or where could I buy another one?

[@solen1849]

Wondering this too, nobody ever says in the videos for other products too . Like people forget what's it like to be new and not know by site what every connector in existence is called or looks like

[@stevebushwa]

a bit late to this but i think it is a jst 2.0, might be wrong

[@Jake-wl2ol]

I love the modability

[@DFEUERMAN]

I recommend adding kapton tape to entire back of the screen. The back of the screen looks like thin-steel or aluminum, and it's is conductive. One youtuber demonstrated in his battery mod video that this metal back is charged at something like 5v, so it causes bad interference if the screen touches the circuit board. (It was happening to me.) Yeah, so about 2 or 3 single layer pieces of kapton tape did the trick! (depending on the width of the tape. I think I have a roll of 2" wide kapton.) I hope this helps someone!

[@slicky13]

Does your battery indicator work properly after this mod? I tried this and now my battery indicator doesn't work for both the new battery AND the old :(

[@danrobinson2866]

Is there a reason everyone is modding these instead of just using the included 3s external battery cable?

[@stonesrcchannel]

I modified the lens. I found that no adjustments for your eyes, I could not focus clearly, so I modified a spare fresnel lens I had laying around which made the screen crystal clear for my eyes. The best improvement I made with these goggles.

[@RagTheNutsOff]

Howdy, ah I saw the spacer blocks on Thingiverse to print, that would also do it too. Matt

[@samcollins6394]

Similar to yours I have the Black Pearl diversity monitor attached to the top of my tx with 3500mah 3s li-ions . I run my fatsharks also but it's so much nicer to be able to hit rth and just follow it back on the monitor. As always great info matt

[@morskoyzmey]

What about battery charge indicator and working time?

[@AMARFPV]

Will the goggles work by just using the charging connector on the left side, and remove the internal battery?

[@JediSwordMasters]

Some people on a forum i was just on say yes. Eachine even sells a cable that goes from that plugin to a common battery plug type

[@thecraftking113]

I modified mine straight out of the box . i mount a 2200 3s on the top with a balance lead coming out of the case . I find its better balanced than battery in front 😁 good mod ✌

[@denaamisharry1350]

Mounted to the charging port or the old internal battery connector?

[@hairygamer6630]

@@denaamisharry1350 I think the battery port is 2s voltage and the charging port can take 3s? In which case I'd just remove the battery, add XT60 to charging circuit and keep the battery in my pocket to lighten the goggles. I'll try unplugging my battery when they arrive and test to see if they can run just off the charging circuit.

[@denaamisharry1350]

@@hairygamer6630 tell me how it worked out ASAP, and to which voltage does the goggle turn off? I’m planning to take out the internal battery too and use a 2s li ion

[@davdaya]

Hi Matt.. sooner or later the power on off switch will not working too.. so i ended bridge the switch contact point so that i just plug in the 3s cable adapter to get it working with a 3s lipo..

[@softstart100]

Has it been 2+ yrs. Well thanks for the info and I will be making a mod to my Ev800d, for a external hook up to use or mount for a ground station using your on board hook up. Happy I found you and I will sub to see what your up to, lol. Thanks xgain.

[@josephfreeman5289]

sweet. just did this mod except im running my battery to the back of the head to help ballance weight. next mod will be ski goggles to the front i think for better fit

[@parkourrush3820]

What are tour setting on the goggles like xontrast brightness and that stuf

[@dsa1302]

You've cut the wire of old battary, BUT!!! you forgot 2s balance pcb (it's placed under film). Without this balance pcb - charging extremely dangerous!

[@JasonEllingsworth]

One solution is to use protected cells like www.orbtronic.com/protected-3400mah-18650-li-ion-battery-panasonic-ncr18650B-orbtronic

[@solen1849]

What connector is on the battery

[@AsgardStudios]

Excellent mod! Thanks for sharing

[@attomfpv4175]

not worth the time? these are my fav goggles i have so much i can do with them

[@RagTheNutsOff]

Howdy, yea. I just didn't get on with them. I was also a bit mean to them to be honest. The screen is fantastic. I need to review my original thoughts and print that spacer it needs. Matt

[@JediSwordMasters]

@@RagTheNutsOff do you mean a spacer to get screen even further from eyes for better focus?

[@krisgleave]

I’ve upgraded mine now too, with 2 x 18650 batteries in an eachine adapter and barrel connector. However after using for 30 mins the battery on the display was showing 1 bar however the actual charge on the holder for the 18650’s said 3 out of 4 bars. Do you have to make a change to the battery voltage actually on the display so it shows the correct bars based on whichever battery you’re using?

[@ForbiddenOldman]

I suppose my fifty-year-old eyes will also require an extender for goggles ( myopia

[@tankogenonrcgroups9750]

I need goggles some old ones to add batteries, plus mine are getting old to as well also

[@madladdan]

Will the voltage sensor still be accurate with Li-ion nominal charge being 3.2V compared to 3.4V for the stock Lipo?

[@zoltankovacs6785]

what size is a standard fpv flight (3-4min)? how big should your sd card be?

[@SunriseWaterMedia]

This looks daunting for me as a n00b, but I'd like to get your opinion on what's the best 3s lipo for external backup power. Does C-rating matter? What about mAh?

[@JerryKanMan]

I would have attached the battery on the strap somehow to take the pressure off of the nose. Then you could have charged it with an XT60 and a balance charger.

[@FraggsUK]

What type and where do you get your li ion batteries from? I see loads from China but prices and I guess quality differ massively

[@Nico99993]

if your still interessted. i use Liitokala Lii-34a 3400mah Cells they have 5.4 amp continous draw and 10amp burst draw. they are about 2.50USD on Aliexpress. i built 3 ebike battery with them and had no issues till now. from 150 cells only one had low voltage out of the box but works good in my flashlight so they have a good quality i think

[@sliggy6834]

thanks my guy :)

[@bobfin4291]

I put a 4000 2s flat pack Turingy Pack in it . Heavy yes I dont giva.....

[@KaizerTest]

How are you charging the pack?

[@dougmcpheters1546]

Mine doesn't recognize the SD card!

[@RagTheNutsOff]

Hey Doug, is the card too big? Mine won't take a 128Gb card, buts ok with a 32Gb one. Matt

[@dougmcpheters1546]

@@RagTheNutsOff no Sir... As small as 16. But, I have smaller ones I'll give a go... Thanks!

[@henryreusch6313]

The Google's need Fat32 afaik

[@benx104]

2 things, 1, you didn't actually show us how you did anything. 2, what is the point in putting larger batteries in the front, when they just make the goggles even more front heavy, instead of showing a mod on how to mount them to the back of the strap, or side of the goggles?

[@Pedrusko]

Stock batteries on these are crap. This will be VERY useful. :)

[@JasonEllingsworth]

This is a bit of a dangerous mod you have done here. You disconnected the PCB from the unit(it is in the battery pack) You can do this exactly as you have displayed, but only if you bought 18650's with internal protection. The much better solution is to wire up your batteries instead with a balance PCB and then go from that to your xt60 connector. They are thin enough that it should still fit if mounted on the side. If you want to get real pro, mount the balance pcb inside the unit, and then run the wire from that to a female xt60 or barrel plug mounted in the case. Then run a long wire with your chosen male connector to a battery pack on the back of the strap or to your pocket. This will take weight/leverage off of the front of the unit, and make the goggles more comfortable.

[@RagTheNutsOff]

Why? The board has a charging circuit on it, the Li-on cells work to 4.2V the same as the lipo. Works fine for a year or more now. Internal protection is not needed for this.

[@JasonEllingsworth]

@@RagTheNutsOff i didn't say it wouldn't work. It's just dangerous. The board has a charging circuit, but i believe the over voltage and over discharge protection is in the pcb of the old battery

[@JasonEllingsworth]

@@RagTheNutsOff i didn't say it wouldn't work. It's just dangerous. The board has a charging circuit, but i believe the over voltage and over discharge protection is in the pcb of the old battery

[@RagTheNutsOff]

@@JasonEllingsworth that's incorrect. It was a simple lipo with no protection. See the video as a reference.

[@JasonEllingsworth]

@@RagTheNutsOff unless they changed something, i have a pcb under the shrink wrap of the battery. If you change the battery you have to also reuse the old board or use a suitable alternative

[@roddysallie9861]

☕️👍

[@miguelvale7364]

Doesnt look that good of a mod. You forgot to comment how heavy they are now with this new battery...

[@JediSwordMasters]

He is not using them as goggles so extra weight is not as much of a concern

[@doubletapgaming1189]

Terrible goggles? Really?

[@RagTheNutsOff]

Yea, they need the extension block printing for them. I have issues focusing on the screen as I have "normal" eyesight 😂 Matt