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Team CheckPoint 7.4 volt 5400mAh Lipo Car Pack and Pro Lipo Balancer Review
Introduction
My RC car and truck operation is definitely sport-oriented, but I do occasionally street race some of the local teens and an adult friend. This new battery pack gives me the edge with the power to win and win repeatedly! Its advantages are in the voltage, the amperage and the weight; With more speed and energy reserves, it lets me operate my truck longer with less down time for charging. The Team Checkpoint Pro LiPo Balancer allows me to keep the pack in balance with the balancer by itself or by using it in combination with my LiPoly charger.
Contents
Team CheckPoint Battery pack
Pro Lipo Team CheckPoint Balancer
Additional Item Needed for battery pack:
Additional Item needed for Balancer:
Assembly
Battery Pack
The battery pack comes assembled, and the cells are in a protective rectangular box. Unlike all other battery packs that I have owned there were no wires coming out of the pack to plug into an electric speed controller (ESC) to power a car or truck. Instead there are three female sockets at one end of the pack. The female sockets for negative and positive are 4mm in diameter and round, and between them is the third socket which is 2mm and is used with the balancer in balancing the pack. I had to create a wire connector to connect the batter pack to the ESC. My test vehicle was my new Duratrax Evader, and its ESC is still wired with a Tamiya connector. For this review I bought a matching Tamiya connector and soldered on two male 4mm circular (Great Planes) connectors. The Tamiya connector plugs into the ESC, and the 4mm male connectors plug into the battery. The parts to make my connector cost about $9.00.
Balancer
The balancer came fully assembled and with the necessary wire connector to connect the balancer to the Team CheckPoint battery. At the other end of the balancer there were wires to connect to a charger which have 4 mm round male connectors on the end. This worked great for me, so there was no assembly required for me to use the balancer by itself or with my charger.
Benefits of Using a Lipoly Pack
The 7.4 volt 2-cell Lipoly pack will supply substantially more voltage then a 6-cell 7.2 volt Nicad or NiMH battery pack, and for equal amperage it will be lighter. In this case I am replacing a 2000 mAh 7.2 volt 6 cell Nicad pack with the 5400 mAh 7.4 volt 2 cell Lipoly pack giving me more power to the ESC which translates to more speed and climbing power and more than 2 1/2 times the running time per charge of my 2000 NiMH 6-cell battery pack.
The True Comparison on Voltage and Weight
Fully charged without load, my NiMH battery pack reads 7.9 volts on my Watt Meter while the Team CheckPoint battery reads 8.4 volts, a difference of a half volt. The weight of my NiMH battery pack was 9/10 of an ounce heavier. Both of these are relatively minor differences, but both are in the favor of the Team CheckPoint battery. I would much rather have the Team CheckPoint battery in my Truggie. The Team Checkpoint battery starts with more power/speed and that continues through a race. In a longer race, the Team CheckPoint battery remains fresher than the NiMH pack. It’s a little faster at the beginning and continues to be comparatively faster throughout the race; the longer the race the better.
Is a Balancer Really Necessary?
I am now a complete believer for safety and financial reasons that a balancer is absolutely necessary for the proper charging and maintenance of Lipoly battery packs. This Team CheckPoint balancer allows for balancing the Team Checkpoint battery back with just the pack or with a charger as a flow through balancer during the charging process.
The reason a balancer is necessary is to keep the voltage in the cells in the battery pack with the same amount of voltage and mAh. Over time the cells in a pack have a tendency to get out of balance, and one cell can get overcharged while one cell remains undercharged. Left uncorrected, this situation can in the worst cases can ruin a battery pack or lead to fires. A balancer helps you keep everything in check, and safe.
How Does This Balancer Work?
If you connect only the balancer to the Team CheckPoint 5400 mAh battery pack, it will read the voltage in the two cells and discharge the more charged cell until it has the same voltage as the cell with less voltage. It balances them. Working with a LiPo charger, the balancer connects to the charger and the battery pack, and the charging is done through the balancer. If one cell gets more of a charge than the other cell, it discharges temporarily halts charge to that one cell while still overall charging the other cells in the pack. This action is displayed by a flashing white light LED in front of the numbered cell that is being discharged charged by through the balancer." The balancer is designed to balance up to three cells, but the harness that comes with it can only handle two cells. It matches the Team Checkpoint battery, but also has greater capability for the future (another harness will be necessary).
Securing the Battery Pack in my Truggie
My Evader is designed to secure the battery pack with a top bar that holds the pack in place, and the bar is secured with a cotter pin. However, as shown in the picture below the bar didn't work with my NiMH - it was too tall. The same was true for the Team CheckPoint pack. I added Velcro to the floor of the battery compartment and one side of the battery pack, and it has worked fine for on and off road driving; that battery pack has not shifted or come loose.
Operation
A battery pack does not need to be balanced with a balancer every time that you charge it. I like to balance a pack with every third charge but I know others who do it every fifth and one every tenth charge. I prefer to error on the side of caution and balance more then I might have to for proper operation of the battery pack. For this review, I balanced the battery pack with and without the charger. There was a lot of on and off flashing of the white lights for cell one and two using the balancer with a charger. I prefer to charge the battery and then balance without the charger. I balanced the battery pack with the balancer as a stand alone discharge balancer when I first got the pack, and it only worked about 30 seconds before the balancer stopped. The cells arrived basically balanced, but only partially charged. After the first three charges, it took seven minutes of discharging cell two to get it in balance with cell one. I do not know what the voltage difference was at the start. After six charges it took four minutes for the balancer discharging one cell to get the cells back in balance. After nine charges it took slightly less then a minute to get them back in balance. I used the balancer with the charger on charges 12 and 15, and it was discharging cell two initially during the charge but shortly started switching back and forth between cells one and two on both of those occasions. As of this review, this is still a pretty new pack with only 16 charges and discharges. I want to point out that I usually operate my truck for a maximum of 1/2 hour at any one time. I never go to to a track and run it all day. For my operation, I get maximum use of my truck with this battery, and then I can charge it at home when time is not a concern. At a 1 C charging rate and with 5400 mAhs, a very discharged pack takes some time to recharge. (I would estimate about an hour with a charger capable of charging at 5400 mAh). For my use, this pack fits my needs perfectly. The added speed off the line and through the race due to the extra voltage gives me the winning edge at least for now. My jumps also appear to be a little higher as well. In doing this review, I had several sessions with my Evader of ten minutes of solid operation on the track and a little over 1,000 mAh after charging the pack, so I might be able to get up to 50 minutes of operation. I didn't test this as every motor and driver will be different.
Storage of the Battery Pack
It is recommended that you store LiPo packs with about a half charge. If you won't be using it for a while, leave it with a half charge. Don't store it near fully discharged or charged.
Are these Battery and Balancer for a Beginner?
YES, YES YES! Some minor soldering skills were necessary to make the power harness to connect the battery pack to the ESC. If the person has those skills, then beginner or expert should have no problem operating his or her electric car or truck with this battery pack.
Conclusion
I found this new Team CheckPoint battery pack to be solidly built. It worked perfectly throughout my test runs, and the Balancer kept the cells in balance as desired. I am very happy with both the battery pack and the balancer and they get my top recommendation.
Pluses
Minuses
Last edited by Angela H; Apr 22, 2008 at 09:56 PM.. |
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Thread Tools |
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#2 |
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Canucklehead
Join Date: Apr 2004
Location: GTA, Ontario, Canada
Posts: 827
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The balancer is just a rebranded Great Planes Equinox. The two are identical.
http://www3.towerhobbies.com/cgi-bin...?&I=LXMGS7&P=0 It's a pretty decent balancer for the money, especially for people who just have small electric stuff. It's odd though that the balancing lead as well as the battery itself uses banana plugs. It would have been better had the pack included hard wired output and charge leads. It's a bizarre setup. Is this standard in lipos for cars? |
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#3 |
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Registered User
Join Date: Apr 2001
Location: Stockton, Ca. USA
Posts: 6,933
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Hello orinda635:
I believe this balancer is in the same family as the Great Planes Balancer as well as the V-Balance from Flight Power, none of them are actually identical. the CheckPoint balancer is designed to balance 2-3 cell packs. the Great Planes Balancer will balance packs with up to five cells and the V-Balance by Flight Power will balance up to six cell packs. How they function is probably very similar. With cars and trucks you will only be working with 2-3 cell packs and the current pack sold under the CheckPoint name connects to this balancer with the included connector. Thus this pack matches up perfectly with this balancer. Speaking of similar; Flight Power has a very similar looking 7.4 Lipoly pack with a different colored case and it has only 4900 mAh if I remember correctly. Mike H |
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#4 |
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Registered User
Join Date: Dec 2006
Location: washington
Posts: 1,620
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That's a nice review. But Gosh... I don't see how they can get away with charging so much for it. I'm not convinced that it's better than the lesser expensive (with an extremely high reputation) Maxamps Lipos.
Keep in mind that the quicker you discharge a Lithium pack the more out of balance the pack can get. Using in your stock Evader is probably OK to not balance every single charge for just a 2-cell pack. Add more cells or drain it faster and you really should balance it every charge. |
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#5 |
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Registered User
Join Date: Apr 2001
Location: Stockton, Ca. USA
Posts: 6,933
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Mtfly2000:
This pack is designed to be at the very top of those available to give the serious racer the competitive edge or at least prevent him from being behind if his opponent is equally equipped. That edge usually doesn't come cheap. CheckPoint has a quality name in racing equipment. As to your last comment: Yes! More cells or a much quicker drain you may want to balance more frequently. That said I am more concerned in getting those who don't balance ever...to start balancing before they have an accident. Too many still think of a balancer as an optional piece of equipment and not a necessity when using Lipolys. It took me awhile to fully appreciate the need. Thanks for the comments. Mike |
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#6 | |
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Registered User
Join Date: Dec 2006
Location: washington
Posts: 1,620
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Quote:
My comment about comparing it to www.maxamps.com was a matter of value. Many guys here race and bash extremly high power set-ups with MaxAmps Lipos I've never heard anything but praise (and they're cheaper). It's just my feeling that Team Checkpoint is pricing this battery out of sales. |
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#7 |
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Dance the skies...
Join Date: Dec 2003
Location: Sammamish, WA
Posts: 6,249
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This balancer and the Team Checkpoint charger look like rebranded Hyperion LBA10 and ICE hardware, respectively, to me. Both very good quality components if they are the same.
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