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Hi I have an older car that I have not driven that much. I took it out and dusted it off charged the 2 NiMH 6 cell batteries but getting very mixed results. My Voltz 5300 mAh seems to charge and a multimeter shows it has a voltage of 8.2 from a search on the internet I believe it supposed to get closer to 8.7. When I use it in the car it will not drive on the road. If I lift it up the wheels will spin quite fast but then it will not move on the road it almost rocks back and forth in one place. Is this just the Battery that has gone and is not giving the car enough power to drive. My stock battery SC 3800 mAh that came with the car works a little better. I tested with a multi meter and after charging this is around 8.4v. The car will run but if you pull the trigger hard to full throttle it will not do and tends to stop start. If you gradually pull the trigger it will get up a little speed and run smoothly but you can't do any sudden acceleration or it goes back to the stop start. My Car is a BSD Flux Assault version 1 Ezrun ESC Motor is a KV3570 I think i know the answer but want to check as I'm novice at this. I assume the issue with the stopping and starting is caused by the low voltage on the battery pack is that right? Is there anyway to re-condition the batteries? Whilst they are maybe 4-5 years old they have only been charged maybe 20-30 times. Although they were left in the box for maybe 12 months unused. I'm current have quite a basic charger Vector AC/DC NX85 which can only charge it can't discharge the batteries. If i have to replace the batteries i was considering moving to LiPo good or bad idea?