As @Maiphut commented, those are crap batteries, with a crap charger and those are dangerously low numbers for an 11.1V battery
A correctly fully charged 11.1V done with a proper quality balance charger will actually output somewhere around 14 volts when charged properly.
The 10V output you have shown, along with the cheap tiny batteries is the whole cause of probable any issues that you might be experiencing with that blaster.
This is poor enough to effect FPS, ROF, Accuracy and feeding issues from the magazine.
Get yourself a proper TURNIGY battery, either single or nunchuck style deposit on your available spaceā¦ and MOST importantlyā¦ a quality battery charger such as a SKY RC as recommended above
Using this motor, with the modifications you have previously listed, combined with this battery will definitely lead to very poor performances, motor/battery overheating and extremely short battery life
Itās like building a Ferrari and then fitting a Briggs and Stratton power trainā¦ā¦. just aināt never gonna work
Thanks @DocBob and @Maiphut ,
I will replace my batteries and charger ASAP.
Iām so frustrated with Gel Blaster retailers right now.
I sent my blaster back under warranty when I first bought it as the motor was too hot to touch after one magazine of gels and they replaced the motor, at that same time I returned the B3 charger that they sold me with the blaster as it died on first use. The X Force balance charger was supposed to be an upgrade and I paid extra for it.
Iām guessing that the batteries and charger have been a problem from the start, I even sent it to a tech and paid for them to fix it when it started happening again as I had made the upgrades so voided my warranty.
You would think that the retailer would know more than the average punter and not sell products that are not fit for their purpose.
Thanks again to the brains trust for giving me the advice that I needed.
Cheers.
Just check your Dimensions: 116x16x19mm battery size for the turnigy. Just doing some reading might not fit in your MP5. hmm but the Bigrrr one lists as 150x30x30 size so I dunno probably typo canāt be that big surely.
The Bigrrr battery has a basic 20c discharge rate so will struggle with upgrades like heavier springs etc. Not many options out there from a quick look.
Hi @Maiphut , thanks for the advice, I ordered the Turnigy Nano-tech 1200mah 11.1v 3cell 25-50c Li-on Battery. My MP5 is front wired so I should be able to fit it in the hand guard. If not I will attach a mock PEQ battery box to hold it.
Something funny is going on here. I was just reading through the thread.
In the picture it shows a bigrrr mosfet. Is it the bigrrr mosfet?? If so I have these on all my blasters some front wired and some rear. All bigrrr mosfets have mag prime. Itās a setting that can be switched on and off via a combo of selector movements and trigger pulls. If you are unable to put it into mag prime this could point to an overarching issue.
Now the only times Iāve experienced what you are describing with a bigrrr with batteries and wires getting hot was with one that had a damaged wire and a another where the wiring had broken near the motor spade connector and it wasnāt visible. Poor soldering can also affect their performance.
I have been able to run all sort of batteries with zero issues both 7.4v and 11.1v. Even super tiny batteries I have run in the handguard of my MCX rattler.
My gut is telling me even if you get a turnigy you will still have issues.
I know it will be a pain but make sure the wiring is spot on everywhere.
Iām new to this forum, and for some reason I couldnāt make any post. But I am having similar issues with my LDT MP5 And hope someone here could give me some advice.
Out of the box it was shooting 180-200fps.
At first I just upgraded the spring, and manage to get around 250-260fps which is pretty reasonable. However, I noticed that while chrono, fps wasnāt consistent. It will be like 250+ > 260+ > 270+ then all of a sudden 160+ > 180+ > 200 > then back to 260+
On top of that, I also noticed some feeding issues.
At first I suspected that it was an air leak. I changed to a green O ring and a new nozzle head. Tested it definitely had good air seal. I also swapped to a stainless steel barrel 7.3mm
After wards, it was getting around 280-300fps, but it is still getting some random FPS drops.
However when I shoot it at full auto, it is shooting fairly accurately with a reasonably straight stream and tight spread. I have a hopup too
Any idea what could be causing the random FPS drop?
Itās using a nylon gearbox with metal gears. Considering to get a full metal receiver and LDX gearbox soon
Biggest issue I found with the nylon gearbox version was cylinder to barrel volume ratio is a bit off being ideal. They really need a 60-70% cylinder to get consistent fps between shots.
Standard a lot came with the notched blowback cylinder which is closer to an 80%.
Also recommend disabling blowback for reliability.
Which LDT MP5 are we talking about? The MP5 or MP5K?
As Roksolid said, getting your VE right is pretty crucial with these. If itās a K, the LDT 80% cylinder isnāt well matched to the short barrel at all.
For reference, we put an upgraded MP5K fitted with a 70% cylinder through the chrono with three or four different barrel lengthsā¦ the longer the barrel, the higher the FPS.
Short standard MP5K barrel pushed around 210FPS then it stepped up incrementally to 280FPS with the longer MP5 A3 length barrel.
With the short barrel all the upgrades only gave a gain in FPS of about 20, but the same upgrades resulted in close to 60FPS gain wit the longer barrel length.
The solution was to integrate a length of inner barrel into a suppressor which gave BME the option of a lower powered shortie or a higher powered longer unit.
I completely agree that the stock LDT MP5 comes with a 80% cylinder, which is way too much for such a short inner barrel.
I would consider changing it to a 70% or even 60% once I get my hands on the LDX gearbox and a metal receiver. Right now its fully stock and I do dont see a point upgrading whichever one without the other since it has to be stripped down to the teeth anyway
LDX are easy enough to come by and are a good replacement gearbox in mp5.
I have a metal MP5, and it is only the upper receiver that is metal, lower is the same for both.
The metal version even though it is only the upper that is metal is very hefty.
probably typo canāt be that big surely.
