Fishfinder battery good deal

I have a couple of Turnigy 5000mah batteries but this sale price on a 10000mah model is an even better deal & weighs in at less than 2lbs. Also it's at a higher/better voltage than all of the el cheapo Ebay models. These are quality LIPO batterys.  You really should have a proper cell balancing LIPO battery charger though.




http://www.hobbyking.com/hobbyking/store/__66480__Multistar_High_Capacity_4S_10000mAh_Multi_Rotor_Lipo_Pack_AR_Warehouse_.html

That's a great deal for those of you who are switching to the lipo movement.thanks Jim

I have ordered a Lowrance elite 4, would one of these be a good choice?   


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That should work just fine on almost any kayak sized Lowrance unit.

I saw this yesterday, and now I feel like a jerk for not mentioning it here!

I have a multistar 5.2Ah 4S and 2 6Ah 4Ss, and the 5.2 will power my Dragonfly 4Pro for two days. I actually just bought two more 6Ahs for my friend's new striker 4. If I hadn't just bought the 6Ahs, I would be all over this.

You really should have a proper cell balancing LIPO battery charger though.

This is a very good point. This is a good one:

http://www.hobbyking.com/hobbyking/store/__64345__Turnigy_Accucel_6_80W_10A_Balancer_Charger_LiHV_Capable.html

One other thing that you have to be aware of is that you don't charge your LiPo past what your FF can handle. A 4S (4 cell) LiPo will charge to 4.2v per cell, or 16.8v total, so you need to compare this to what the manual for your FF says is the top end of the voltage range. In the case of my Dragonfly, the most voltage it wants is 15.6v, so I keep my eye on the voltage and stop it when the cells get to just shy of 3.9v each.

This is a very good point. This is a good one:

http://www.hobbyking.com/hobbyking/store/__64345__Turnigy_Accucel_6_80W_10A_Balancer_Charger_LiHV_Capable.html

One other thing that you have to be aware of is that you don't charge your LiPo past what your FF can handle. A 4S (4 cell) LiPo will charge to 4.2v per cell, or 16.8v total, so you need to compare this to what the manual for your FF says is the top end of the voltage range. In the case of my Dragonfly, the most voltage it wants is 15.6v, so I keep my eye on the voltage and stop it when the cells get to just shy of 3.9v each.

Just wanted to point out that charger does not have a power supply. You need to get a power supply or power it from your car battery. I prefer the Skyrc B6 with the built in power supply.

And just fyi, from 3.9v to 4.2, those 0.3v holds about 60% of the battery's capacity. It's like you're charging it to 40% full, which I'm sure is not what you want. The right way to power your Dragonfly with a 4S lipo is by using a buck convertor and down convert the 16.8v to ~12v. The convertor is small and cheap. You'll appreciate gaining back the 60% runtime.


ernest

This is a very good point. This is a good one:

http://www.hobbyking.com/hobbyking/store/__64345__Turnigy_Accucel_6_80W_10A_Balancer_Charger_LiHV_Capable.html

One other thing that you have to be aware of is that you don't charge your LiPo past what your FF can handle. A 4S (4 cell) LiPo will charge to 4.2v per cell, or 16.8v total, so you need to compare this to what the manual for your FF says is the top end of the voltage range. In the case of my Dragonfly, the most voltage it wants is 15.6v, so I keep my eye on the voltage and stop it when the cells get to just shy of 3.9v each.

Just wanted to point out that charger does not have a power supply. You need to get a power supply or power it from your car battery. I prefer the Skyrc B6 with the built in power supply.

And just fyi, from 3.9v to 4.2, those 0.3v holds about 60% of the battery's capacity. It's like you're charging it to 40% full, which I'm sure is not what you want. The right way to power your Dragonfly with a 4S lipo is by using a buck convertor and down convert the 16.8v to ~12v. The convertor is small and cheap. You'll appreciate gaining back the 60% runtime.


ernest

I agree with Ernest.  3.9v is barely above your safe storage charge, thats when you are not using your battery.  Connect you battery to your smart charger on LiPo Storage setting after a day of use.  The day before you will be using your battery, connect to your smart charger at LiPo Balance Charge.

And just fyi, from 3.9v to 4.2, those 0.3v holds about 60% of the battery's capacity. It's like you're charging it to 40% full, which I'm sure is not what you want. The right way to power your Dragonfly with a 4S lipo is by using a buck convertor and down convert the 16.8v to ~12v. The convertor is small and cheap. You'll appreciate gaining back the 60% runtime.


ernest

Umm... are you serious?! I knew I was loosing capacity, but all of the discharge graphs I've seen made it look closer to somewhere between 10-25%! How sure are you of the 60% figure? As it turns out, I had already bought a RioRand buck converter for my livewell so I'm familiar with how to use them. I guess I'll order another one!

Umm... are you serious?! I knew I was loosing capacity, but all of the discharge graphs I've seen made it look closer to somewhere between 10-25%! How sure are you of the 60% figure? As it turns out, I had already bought a RioRand buck converter for my livewell so I'm familiar with how to use them. I guess I'll order another one!

You can use that RioRand for your battery box, and get yourself a PWM for your livewell. PWM is designed for motor control, and it's typically adjustable with a knob (potentiometer).

3.9v is only a tad above the typical Storage charge. From the Storage charge to full charge (4.2v) is about 60% of the total capacity based on my Skyrc. I always test my new lithium batteries. I have four of those 10ah batteries that Salty is referring to. Even if it's not 40% full at 3.9v, it would be close to that. You can do a drain test or do a full charge from 3.9v using your smart charger. It should give you the data you're looking for. Have you ever tried a full drain test on your battery? It's nice to know your battery's true capacity.

Sorry for the thread-jack Jim. I'll shut up now. 

Umm... are you serious?! I knew I was loosing capacity, but all of the discharge graphs I've seen made it look closer to somewhere between 10-25%! How sure are you of the 60% figure? As it turns out, I had already bought a RioRand buck converter for my livewell so I'm familiar with how to use them. I guess I'll order another one!

You can use that RioRand for your battery box, and get yourself a PWM for your livewell. PWM is designed for motor control, and it's typically adjustable with a knob (potentiometer).

3.9v is only a tad above the typical Storage charge. From the Storage charge to full charge (4.2v) is about 60% of the total capacity based on my Skyrc. I always test my new lithium batteries. I have four of those 10ah batteries that Salty is referring to. Even if it's not 40% full at 3.9v, it would be close to that. You can do a drain test or do a full charge from 3.9v using your smart charger. It should give you the data you're looking for. Have you ever tried a full drain test on your battery? It's nice to know your battery's true capacity.

Sorry for the thread-jack Jim. I'll shut up now. 

No worries bro. It's been you & Mel that got me to make the switch to LIPO batteries & I'm glad I did. For my i11s I threw on my old Elite4 & ran one of my 5000mah batteries which worked just fine. Of course it reminded me how puny that screen is.    & now I gotta take it off & mount up my Elite5 chirp so I can see the damn screen. 

I saw this yesterday, and now I feel like a jerk for not mentioning it here!

I have a multistar 5.2Ah 4S and 2 6Ah 4Ss, and the 5.2 will power my Dragonfly 4Pro for two days. I actually just bought two more 6Ahs for my friend's new striker 4. If I hadn't just bought the 6Ahs, I would be all over this.

You really should have a proper cell balancing LIPO battery charger though.

This is a very good point. This is a good one:

http://www.hobbyking.com/hobbyking/store/__64345__Turnigy_Accucel_6_80W_10A_Balancer_Charger_LiHV_Capable.html

One other thing that you have to be aware of is that you don't charge your LiPo past what your FF can handle. A 4S (4 cell) LiPo will charge to 4.2v per cell, or 16.8v total, so you need to compare this to what the manual for your FF says is the top end of the voltage range. In the case of my Dragonfly, the most voltage it wants is 15.6v, so I keep my eye on the voltage and stop it when the cells get to just shy of 3.9v each.

I own the same 10 amp battery Salty is referring too.  It is not healthy to store your Lipo battery at a high or low voltage capacity. 

Here's the math on mine. The safest cut off is 3.4 volts per individual cell of 4 cells. The fully charged battery is 4.2v per cell or 16.8v for 4s. Therefore, there is 0.8 usable voltage. 50% of 0.8 is equal to 0.400. Add it to 3.4 volts, it is equal to 3.800. I assume an allowance of 3.8 to 3.85 volts for storage charge value.

Hmmmm. I've been charging to 16.8v the night before fishing with no problems so far. What could  happen?

Hmmmm. I've been charging to 16.8v the night before fishing with no problems so far. What could  happen?

You are good charging them to 16.8v the day before.  What I meant earlier is 4 cells at 4.2 v each that equals to 16.8v at full charge. Do not store your Lipo at full charge like a lead acid battery when not in use.  As I mentioned earlier, after using connect to your smart charger at Lipo Storage setting this should bring it down to approximately 50% capacity.  Then to LiPo Balance Charge the day before using.  This prolongs your battery life.

Here's a good article.

http://ozarkmountainbarnstormers.com/pdf%20files/Lipo%20Storage%20Tips.pdf

Man it seems complicated    I'm liking the prices of these better than the others I've seen though.