a battery pack for eggtimers?

[Titan II]

Said circuitry is in the charger and the speed control.

I know. I'm sure Azamiryou does too.

However, I don't believe that many of the applications for rockets such as some altimeters and trackers have discharge limits. That is where your brain and due dilgence come into play.

 

[sr205347d]

That is where your brain and due dilgence come into play.

The OP doesn't seem to be aware of the proper due diligence.

 

[sr205347d]

However, I don't believe that many of the applications for rockets such as some altimeters and trackers have discharge limits.

Some Eggtimers do.



But will his charger?

 

[Titan II]

Eggtimers do.

View attachment 679346

But will his charger?

All of them? Altimeters and trackers? I really do not care as I do not use them. Since I don't, I am not going to do any research, but "outputs being overcurrent, overvoltage, under voltage and termally protected" does not answer the question if the unit has a low voltage cutoff. Many prefer units that do not have low voltage cutoff.

 

[NTP2]

But will his charger?

the charger is the one in the pack

The OP doesn't seem to be aware of the proper due diligence.

I am, I'd test first with a bucket of water I could drop the bat in if it gets too happy.

 

[sr205347d]

To save money on a charger, get a 1S charger, and then connect the cells in series for use.

 

[sr205347d]

To save money on a charger, get a 1S charger, and then connect the cells in series for use.

Or,

 

[cerving]

All of them? Altimeters and trackers? I really do not care as I do not use them. Since I don't, I am not going to do any research, but "outputs being overcurrent, overvoltage, under voltage and termally protected" does not answer the question if the unit has a low voltage cutoff. Many prefer units that do not have low voltage cutoff.

That applies to the deployment circuitry on Eggtimer altimeters designed for 2S Lipo's (Quark, Quantum, Proton, and Quasar). The GPS trackers will use just about any 2S Lipo too... and they'll keep working until your battery is exhausted. Not having an undervoltage cutoff on them was a design decision... you do not want your tracker powering off if you're trying to locate your rocket.

 

[Titan II]

Not having an undervoltage cutoff on them was a design decision... you do not want your tracker powering off if you're trying to locate your rocket.

Agree 100 percent.

 

[MikeT]

https://www.motionrc.com/collection...m_fields.Number_of_Cells][0]=2 Cell (2s) 7.4v

 

[David Schwantz]

Why chance your rocket and the SAFETY of others to something that was rigged up to save a few pennies. There are so many ready made packs and charges out there, this should not even be a question. Now if you want to try this on a toy car in your basement have at it.

 

[NTP2]

Why chance your rocket and the SAFETY of others to something that was rigged up to save a few pennies. There are so many ready made packs and charges out there, this should not even be a question.

I was unaware of any 2s chargers under $40 at the time, it seemed like the only solution for me at the time.

 

[cerving]

Amazon/eBay are full of B6 knockoffs for < $40. Most of them work fine for what we do, they probably wouldn't last if you were fast-charging an 8000 mAH 6S R/C Lipo, though.

 

[David Schwantz]

NTP2, Motion RC has many options for both batteries and chargers. I have used them for many years. Always good service and product. For the small 2s packs you don't need a really spendy charger. If you charge at home the night before almost all packs will last many launches. I use lots of egg stuff, and a 2s 300 mah pack will last a Quark for many flights.

 

[DarthMuffin]

A $9 2S charger, I use this (and I have more expensive "real" hobby chargers). Does 2 batteries at once, uses USB. Not a particularly fast charge but I'm usually not in a hurry with rockets. https://www.amazon.com/gp/product/B09PBP2HBN

 

[SolarYellow]

That applies to the deployment circuitry on Eggtimer altimeters designed for 2S Lipo's (Quark, Quantum, Proton, and Quasar). The GPS trackers will use just about any 2S Lipo too... and they'll keep working until your battery is exhausted. Not having an undervoltage cutoff on them was a design decision... you do not want your tracker powering off if you're trying to locate your rocket.

Are the W-h more or less constant on the GPS units, since all the power gets put through a voltage regulator anyway?

More specifically, should using a 2S 300 mAh battery with an Eggfinder Mini give me battery life similar to using a 1S 600 mAh battery?

 

[cerving]

Any excess input power with a linear regulator goes to heat, a Mini draws about 70mA from the regulator. A 1S Lipo is going to be much more efficient than a 2S, and it's going to be smaller and weigh less too, and you don't need a balance plug. Go with the 600 mAH 1S, a 300 mA 1S is fine too.

 

[sl98]

I use the SKYRC iMAX B6AC V2 for charging lipos for electonics and also for powering LED's on night launch rockets.

I also use the SkyRC. At $49 and free prime shipping that is a steal. You can not only charge your batteries but you can place them into a storage charge to prolong the life of your batteries if you are not using them for a while. I tried the cheap chargers before getting the SkyRC. The cheap chargers are slow and do not do a good job of true balance charging. You will spend more money on replacing batteries the cheap chargers ruin than if you invest in a decent charger.

https://www.amazon.com/Genuine-Prof...xt&ref_=fplfs&psc=1&smid=A1QU8JLLA027CY&gQT=1