Me too. But 6-cell. I've been running nothing but NiMH since I'm waiting for my packs to die off before I plunge into LiPo.
So far, my NiMH has been super strong and hassle-free...
I run four packs of 3 cell + 3 cell NiMH saddle configuration for my B44, four packs of side-by-side 6-cell NiMH for the rest of my vehicles. Brushless systems I have are:
Mamba Max + 5700Kv
2nd Mamba Max + 4600Kv
Ezrun 60A V2 + 4300Kv
When I initially dove into the brushless system, I did have a fall out of a pack. It made my systems cog, so I found out that pack was really weak.
It's the odd-ball "Sanyo" Team Orion matched pack. I think it had a bad cell in there that couldn't handle the sourcing.
Rest of the packs, they're no prize winners either, they are 4 to 5 year old 3300 to 3600 mAH NiMH, most are GP-based cells (I think GP cells are the best NiMH out there, reliable and trustworthy). But they run strong though...
RIP TAP RC