Value of the rapid charger

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I am wondering if it is worth spending the money to purchase a Rapid Charger for me 5.0ah battery?  I can see that when you get up into the 7.5ah that the charge time would be so long with the standard it would take too long to charge two batteries (say for a lawn mower).

Anyone who has the rapid charger, do you find that the features on the unit make it a no brainer to buy?  Does it show you the charge levels of the batteries when you plug them in to start charging? or is that a progress indicator to see how far it is through the charge cycle?
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matt.mackinnon

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Posted 3 years ago

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Carolinaz Pantherz

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My standard charger is still in the plastic never used. I love the Rapid Charger so much. I can charge one and use the other and when I'm ready to swap batteries or tools it's ready. It makes yard work quick and smooth.
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David HD, Champion

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Matt, I am a "little" different than others in that I used both the Standard & Rapid Chargers regularly.  Since I have two (2) 2.0 Ah batteries and one (1) 5.0 Ah battery, I typically charge my 2.0 Ah on the Standard Charger, while the 5.0 Ah, I use the Rapid Charger.  That being said; I do believe that the Rapid Charger is a good investment to make - for many of the benefits that have already been discussed from above.
(Edited)
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John Cole

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Same here, find the rapid charger is handy when doing a lot of gardening in the midsummer but in general I'm knackered afore the battery-:)
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RDave

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Both charges use the same charging method for the most part (constant current up to ~58 V and then constant voltage until current drops to ~0.5 A). The rapid charger can just deliver more current in the CC phase.

The rapid charger has the potential to degrade battery performance over time more than the standard charger but without long-term tests or knowing if ego has built any smarts into the chargers to help mitigate this, it hard to state that as a fact. 

Overall, the rapid charger doesn't charge the small batteries much faster than the standard charger and isn't really any harder on the individual cells in the larger batteries than either charger is on the cells in the small batteries. 

My general advice would be to not spend any money on the rapid charger but if it came with a tool then don't be afraid to use it, especially if you're on a time crunch.
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Blue Angel, Champion

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RDave, Ego built the "smarts" into the battery packs by wrapping each cell in a Phase-Change material that melts at a specific temperature. By doing this they have mitigated thermal damage due to fast charging (and fast discharging), and thermal damage is what reduces a cell's cycle life.

True, the standard charger is less likely to induce thermal damage in the cells, but the rapid charger isn't likely to do damage either. :-)
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RDave

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I'm aware of the phase-change wrap.

I was more referring to how the chargers deal with a hot battery and if perhaps they take into account charge/discharge cycles for a given battery. As you know, the chargers monitor battery temperature throughout the charging cycle but digital data is also passed between the two and (as far as I know) it's unclear what the purpose of that data is. 

I haven't looked at this in detail, but I believe the chargers reduce current in the CC mode beyond a certain temperature. It's also possible that the chargers reduce current under other conditions but it's hard to know what those conditions are since I haven't seen any long term testing.
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Blue Angel, Champion

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Check out this video. It's the most impressive demonstration of the Ego's battery/charger thermal management. Even hot out of the tool after a 10 minute depletion the charge times stay consistent:

https://youtu.be/8jPgrPtGH7o

True, this is the standard charger, but it's also the 2Ah battery and it's charging in about 35 minutes if I remember right... I haven't watched that video in a while, and it's a long one!
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David Phillips

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We have tens of thousands of lipo and life batteries at work. Been abusing the lipos for five years and they are still going. The chargers are not balancing, they occasionally run down too low, get too hot and get banged around quite a bit.

I'm not too worried about these cells with the superior battery management involved.

Out of 85,000 batteries I think only about a dozen have caught fire.

When they get low on capacity we recently started taking them apart and balance charging them. Most of them come back up.
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Blue Angel, Champion

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Nice! What type of equipment?
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David Phillips

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Seismic recording devices with 10ah batteries