Traxxas 2890X 6700 mAh 14.8V 4-Cell 25C LiPo Battery Vehicle

These are great batteries but to be honest I rarely use the 4s as they are just too much, overkill and I almost always use two 3s batts in my XMaxx.

Batteries last a long time. If you have issues with the batteries return them to traxxas , the are under warranty for a year. Read the instructions on the battery. Only use their charger. They won't last forever no matter how much care you give them but 50 to 80 charge cycles should about be all you get. Do not leave them in the vehicle after they die, charge them or charge store them as soon as you can, no more than a day or so or they will not charge if they have been left connected to the rc vehicle. Once the battery gets below a certain voltage as indicated on the battery you can not restore the battery, you might " jump" it however you run the risk of explosion. LIPO batteries are dangerous and extreme care should always be priority.

Good battery but on the fast charger it still takes a hrs for the first charge

Works as expected, and a good factory replacement for the xmaxx.. Please heed the warnings and do not try to charge if the Traxxas charger will not charge it. Send it back to them for a replacement for half price. If it's puffy and/or doesn't charge it is damaged.

Good product for the money

Be sure to store these at the recommended voltage. Just need to know what your doing these mechines are not toys they are adult hobby battery's. Seriously stong power from these. And the more power the more that can go wrong. Just keep that in mind. don't slam the manufacturer cause you can't follow guidelines on hazardous material.

Oem replacement. Just be sure if you are storing batteries for or not using for a couple of days to “store charge” the batteries so they do not expand. Also use a battery fire resistant bag to charge them in. Happy with the performance of these batteries.

Update: I have a large full service hobby store nearby that sells this brand and has reported to me that these are just very delicate batteries. It's as simple as that. Do not leave your machine on after you're done with it. Even if you're not using it, the batteries will drain out and when they drain out I think they can be resuscitated. I don't know how to do it. They didn't want to get into it. If you have the budget just to buy new ones you might want to do that. But if you don't, I think you can resuscitate yours. Anyway, that's the bottom line on these. These are pushing the envelope of lithium technology and that's just how it is. You're playing with a lot of technology and the benefit is amazing performance. But with drawbacks simple as that. Here's my original review.... You can disregard it. Now that I have found a local shop to advise me, I'm in good hands. And it's fine that it's from Amazon. They don't have a problem with that. I don't really understand maybe somebody can enlighten me. But these will no longer take a charge. I use them once having completely top them off as per instructions. What's also annoying is I don't know what the replacement is for these. I'm just not that into The hobby I guess. All I know is I've lost $600 worth of batteries in one day of driving this thing around my yard. Granted I have a huge yard and I was going straight out. There was a little bit of moisture on the grass maybe that had something to do with it. But this is unacceptable and my last adventure with this Traxxas brand was not good either