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-   -   Battery Charging Question... (https://www.rctech.net/forum/radio-electronics/1032354-battery-charging-question.html)

Davidka 12-17-2018 08:26 AM
Another thing to consider is that charge rate and charge time are not a linear relationship. The Lipo CC-CV charge algorithm tapers current through the last 15-20% of the charge so that that last part can take a while.

For a charger, look ultrapower. I believe they make chargers for several more mainstream brands (the UP120AC looks a great deal like one of Reedy's chargers). Now that you know the wattage you are looking for, you might find what you need there for much less $$ than some of the bigger-name brands. I have a UP100AC Duo. It's tiny, charges two 2s batteries at a time, as fast as I need and runs on AC power. I only wish discharge power was greater, because it takes a long time to storage-discharge at only 1.3a. Bigger chargers should be more powerful in this way.

071crazy 12-17-2018 08:58 AM
Originally Posted by Evoking1230 (Post 15355667)
Thank you for the explanation. I understand that much. Most likely will keep it at 1C but if at the track I'll bump it up to 1.5C to shorten charge time.
I wouldn't worry about charging at 1c to preserve battery life. ebuggy and etruggy already put a lot of stress on a 4s pack. In addition, you are taking life away from the pack if you are consistently pushing it to LVC.
With current racing batteries, charging at 3C+ should be no issue.

Evoking1230 12-17-2018 10:36 AM
Originally Posted by lowspark (Post 15356288)
If you are going to race, chances are you will never have to recharge a battery from zero so your charge times will be a lot less.

Example... I use 2s 8000ma batteries in my SCT... 10 min race I still have approx 25% of the battery left.
I use a Protek charger that is 80w and I charge at 8a. It takes about 30 minutes to charge back to full capacity.

LVC is set at 3.2
Note that I never run my batteries down to low volt cut-off... I use a timer set to 8 minutes when practicing.
this is true. My son wants an eBuggy as well and Im sure he will take that down to LVC on the regular, which is why I was thinking of the iCharger.

Evoking1230 12-17-2018 10:39 AM
Originally Posted by Davidka (Post 15356383)
Another thing to consider is that charge rate and charge time are not a linear relationship. The Lipo CC-CV charge algorithm tapers current through the last 15-20% of the charge so that that last part can take a while.

For a charger, look ultrapower. I believe they make chargers for several more mainstream brands (the UP120AC looks a great deal like one of Reedy's chargers). Now that you know the wattage you are looking for, you might find what you need there for much less $$ than some of the bigger-name brands. I have a UP100AC Duo. It's tiny, charges two 2s batteries at a time, as fast as I need and runs on AC power. I only wish discharge power was greater, because it takes a long time to storage-discharge at only 1.3a. Bigger chargers should be more powerful in this way.
Thank you for the recommendation, I'm looking into them now :-D

Evoking1230 12-17-2018 10:40 AM
Originally Posted by 071crazy (Post 15356414)
I wouldn't worry about charging at 1c to preserve battery life. ebuggy and etruggy already put a lot of stress on a 4s pack. In addition, you are taking life away from the pack if you are consistently pushing it to LVC.
With current racing batteries, charging at 3C+ should be no issue.
even if there's a big warning sticker that says "DO NOT CHARGE PAST 1.5C"? :lol:

071crazy 12-17-2018 11:50 AM
Originally Posted by Evoking1230 (Post 15356480)
even if there's a big warning sticker that says "DO NOT CHARGE PAST 1.5C"? :lol:
And you believe charging at 1c will have a significant effect on the life of your packs. :lol:

Evoking1230 12-17-2018 12:23 PM
Originally Posted by 071crazy (Post 15356525)
And you believe charging at 1c will have a significant effect on the life of your packs. :lol:
I'm new to electric so I'm only following the manufacturers instructions. If I can charge higher than I'll try it.

Evoking1230 12-17-2018 12:24 PM
Originally Posted by Davidka (Post 15356383)
Another thing to consider is that charge rate and charge time are not a linear relationship. The Lipo CC-CV charge algorithm tapers current through the last 15-20% of the charge so that that last part can take a while.

For a charger, look ultrapower. I believe they make chargers for several more mainstream brands (the UP120AC looks a great deal like one of Reedy's chargers). Now that you know the wattage you are looking for, you might find what you need there for much less $$ than some of the bigger-name brands. I have a UP100AC Duo. It's tiny, charges two 2s batteries at a time, as fast as I need and runs on AC power. I only wish discharge power was greater, because it takes a long time to storage-discharge at only 1.3a. Bigger chargers should be more powerful in this way.
Really liking the UP120AC. Question for you, the charge leads that go into the unit are they 4mm banana plugs? Some pics they look bigger.

Thanks!


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