Batteries for a Raider and Senton

[Matt74]

So I installed a Hobbywing EZRUN 3652 G2 3300KV Motor MAX10 60A Combo in my Raider Mega today...
I am also saving up for a new Senton 6S V3 because it looks like more fun than a clown on fire.. I can’t stop drooling over footage of the truck I’ve found on YouTube etc..

The thing absolutely hammers and I want one..... and I have a couple of questions regarding batteries for the Raider and a new Senton 6S...

For my raider I have two 7 cell 4200 8.4v nimh’s and the original 6 cell 2000 7.2v nimh that came with the vehicle. The new hobbywing esc is set to factory settings and I put a 12V fan on it because that’s what the manual recommends if using 7 cell nimh’s.
Anyway, first question, the raider runs great on the 6 cell 7.2v nimh but if I put one of the 7 cell 8.4v batteries in it it runs for about 10 seconds and then cuts the motor.. does anyone know what I could be overlooking here?.. does it sound like the esc LVC function is being triggered by the 7 cell nimh?.. all 3 batteries are fully charged.. thoughts and any possible solutions would be greatly appreciated.

Second question surrounds Lipo’s... so I obviously intend to get some Lipo’s when I get the new Senton.. as I am pretty new to RC I am thinking of starting with a 4S in the Senton instead of going straight to 6S... I would also like to get a 2S for the Raider.. my question is, and sorry if it’s a really dumb one, if I get one 4S 5200mah 90C LiPo and one 2S 5200mah 90C battery can I use both in the Senton to add up to 6S?.. or can you only combine 2 x 3S’s to make 6S?...

 

[Jeremy in WI]

Anyway, first question, the raider runs great on the 6 cell 7.2v nimh but if I put one of the 7 cell 8.4v batteries in it it runs for about 10 seconds and then cuts the motor.. does anyone know what I could be overlooking here?.. does it sound like the esc LVC function is being triggered by the 7 cell nimh?.. all 3 batteries are fully charged.. thoughts and any possible solutions would be greatly appreciated.

The esc will only run with 6 or 9 cell Nimh. It thinks the 7 is a lv 9 cell. Here's a pic of the specs. Note - the right side is the max 10.

 

[2fast4u]

Running NiMh you need to disable the cut off voltage feature in the ESC programing.

 

[Matt74]

The esc will only run with 6 or 9 cell Nimh. It thinks the 7 is a lv 9 cell. Here's a pic of the specs. Note - the right side is the max 10.
View attachment 31418

I read that as it could run on 6 to 9 cell nimh batteries (meaning 6, 7, 8 or 9 cell)... not just 6 and/or 9 cell nimh’s... that’s a bugger if true.

 

[Matt74]

Running NiMh you need to disable the cut off voltage feature in the ESC programing.

So I’d pick program 1 on “programable” item number 3 on the chart on page 3 of the following?;

http://www.hobbywing.com/products/enpdf/ezrunwp80a.pdf

Which would put the lvc to “non-protection” mode..

 

[Jeremy in WI]

@2fast4u is right.

Brain fart, too much whiskey last night... Option 3, turn off and you'll be good to go.

 

[Jeremy in WI]

J

So I’d pick program 1 on “programable” item number 3 on the chart on page 3 of the following?;

http://www.hobbywing.com/products/enpdf/ezrunwp80a.pdf

Which would put the lvc to “non-protection” mode..

Yup, and obviously make sure you turn it back on when you switch to Lipos.

 

[Matt74]

@2fast4u is right.
View attachment 31419
Brain fart, too much whiskey last night... Option 3, turn off and you'll be good to go.

All good... had me worried for a minute there!.. seems I’m looking at the wrong manual myself anyways!..

 

[Matt74]

Cheers to both of you for your responses...

Can I ask both of you if you have a possible answer to my second question in my original post about Lipo’s?..

J

Yup, and obviously make sure you turn it back on when you switch to Lipos.

Running NiMh you need to disable the cut off voltage feature in the ESC programing.

 

[Jeremy in WI]

Cheers to both of you for your responses...

Can I ask both of you if you have a possible answer to my second question in my original post about Lipo’s?..

Unfortunately I don't have any 6s stuff, so I don't want to chime in and end up being wrong.

 

[2fast4u]

Cheers to both of you for your responses...

Can I ask both of you if you have a possible answer to my second question in my original post about Lipo’s?..

To answer your second question. Yes you can do that. The mAh and the c ratings are the same. I should add this though, It is not ideal to use two batteries in series that have mismatched charge/discharge cycles or that have been used in varying discharge scenarios. With use and cycling the capacity (mAh) degrades. So when using them in different applications, the possibility of a mis match raises.

 

[Matt74]

To answer your second question. Yes you can do that. The mAh and the c ratings are the same. I should add this though, It is not ideal to use two batteries in series that have mismatched charge/discharge cycles or that have been used in varying discharge scenarios. With use and cycling the capacity (mAh) degrades. So when using them in different applications, the possibility of a mis match raises.

Yeah, i figured that this may be the case.. but i guess the same goes for using 2 3s batteries... both batteries, whilst being exactly the same battery, will have had different “lives” so to speak.. so one may not be as strong as the other..

I think i might get a 2s for the raider and a 4s for the senton and then, if i want to go 6s with the senton in the future, just buy a 6s..