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Rapidstrike Battery Mod

NiMH

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#1 shandsgator8

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Posted 23 January 2016 - 02:11 PM

There are a lot of questions about how to do an electrical or battery modification to a flywheel blaster, such as the Rapidstrike. This brief write up will explain one way to use a rechargeable battery pack without modifying the major portions of the blaster. All that's modified is the Rapidstrike's battery tray.

 

Advantages of this mod: very easy to do, assuming you have soldering and R/C experience, yet will give a substantial increase in performance (ROF and FPS). You do not need to open the blaster itself.

 

Disadvantages of this mod: not the most efficient (electrically speaking), requires soldering skills and necessitates the user to acquire a rechargeable batter pack (LiPo, Li-Ion, NiCd or NiMH).

 

The following pictures show a side-by-side 6 cell battery pack using 2,000mah Eneloop AA batteries and a Deans Micro Connector.

 

This is such a simple mod and I know many of you have either seen it or done it yourself. However, for some of the newbies out there, these pictures should hopefully explain the basic idea of one type of battery mod.

 

The pictures explain it all:

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Edited by shandsgator8, 23 January 2016 - 02:15 PM.

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#2 Quack

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Posted 23 January 2016 - 06:39 PM

There are a lot of questions about how to do an electrical or battery modification to a flywheel blaster, such as the Rapidstrike. This brief write up will explain one way to use a rechargeable battery pack without modifying the major portions of the blaster. All that's modified is the Rapidstrike's battery tray.

 

Advantages of this mod: very easy to do, assuming you have soldering and R/C experience, yet will give a substantial increase in performance (ROF and FPS). You do not need to open the blaster itself.

 

Disadvantages of this mod: not the most efficient (electrically speaking), requires soldering skills and necessitates the user to acquire a rechargeable batter pack (LiPo, Li-Ion, NiCd or NiMH).

 

The following pictures show a side-by-side 6 cell battery pack using 2,000mah Eneloop AA batteries and a Deans Micro Connector.

 

This is such a simple mod and I know many of you have either seen it or done it yourself. However, for some of the newbies out there, these pictures should hopefully explain the basic idea of one type of battery mod.

 

The pictures explain it all:

This is great for people who don't want to open the blaster. However, if you don't remove the thermistors, the blaster will shut down due to the power going through.


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#3 shandsgator8

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Posted 23 January 2016 - 06:46 PM

Not if you run a 6 cell NiMH AA or Sub C battery pack.


Edited by shandsgator8, 23 January 2016 - 06:46 PM.

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#4 Quack

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Posted 24 January 2016 - 10:04 AM

 

Disadvantages of this mod: not the most efficient (electrically speaking), requires soldering skills and necessitates the user to acquire a rechargeable batter pack (LiPo, Li-Ion, NiCd or NiMH).

 

It should work fine for that but not a Li-po. Don't think I don't like you mod, one of my first mods was a much messier version of this. It is great for modders who have a basic understanding of soldering and batteries. However, I just didn't want someone reading this putting a LiPo in their blaster and wondering why it stops working.


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#5 shandsgator8

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Posted 24 January 2016 - 12:57 PM

It should work fine for that but not a Li-po. Don't think I don't like you mod, one of my first mods was a much messier version of this. It is great for modders who have a basic understanding of soldering and batteries. However, I just didn't want someone reading this putting a LiPo in their blaster and wondering why it stops working.

 

Can you explain why not? Is it because even a 2S LiPo will trip the thermister or something? I'd be surprised if it does, since a 6 cell NiMH hot off the charger can be over 8.5 volts.


Edited by shandsgator8, 24 January 2016 - 12:58 PM.

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#6 jwasko

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Posted 24 January 2016 - 02:29 PM

Thermistors (specifically the PTCs used  by Hasbro) specifically respond to heat, and I that heat is generated by current rather than voltage specifically.

 

Now, generally adding volts (like using an overcharged 6-cell NIMH or a 2S LiPo) will make the motors demand more current...which could cause the PTC to overheat/shut off your blaster.

 

The fact that it is not happening with your NiMH pack means one of three things:

1. The (stock) motors aren't pulling enough current to trip the PTC.

2. The resistance from the stock wiring and spring contacts are limiting the current from the battery to a level that the PTC doesn't trip.

3. Your NIMH batteries aren't producing enough current to trip the PTC anyway


Edited by jwasko, 24 January 2016 - 02:32 PM.

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#7 shandsgator8

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Posted 24 January 2016 - 02:35 PM

Hmmmm, ok. If LiPos won't work with this mod, but NiMH AA cells do, perhaps the LiPos are able to delivery more current than the NiMHs are able to, notwithstanding the resistance of the stock battery contacts and wiring.


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