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I'm sure this must have been done many time before but not recently as far as I could see after a quick search. I was curious as the difference in weights between all my various stick packs because even two supposedly same voltage packs seem to feel different weights just in the hand. Anyway here are the weights of my different types (I do have four each of most of these) but this covers a good range: Tamiya NiCd 1400mah, 7.2v = 326g Overlander NiMh 3300mah, 7.2v = 335g Absima NiMh 3600, 7.2v = 354g Sanyo NiCd 2000mah, 7.2v = 356g Sanyo NiCd 2000mah, 8.4v = 410g Sanyo NiCd 2000mah, 9.6v = 467g What surprised me was the fact the Absima with a claimed capacity almost double the Sanyo for the same 7.2v weighs less. I was expecting it to weight more. Also worth noting that although the Sanyo 8.4v pack weighs 54g more than its 7.2v sibling, my terra scorcher goes 4mph faster using the heavier 8.4v instead of 7.2v in conjunction with a Dyna Run Super Touring, why I have no idea as I thought top speed was limited by pinion sizing and motor rpm's not voltage? I thought it may be of interest to somebody to know some of the charging history and retained capacity of these packs, some of which are 20 years old: (Retained capacity is that stated by my Pro Peak Super Nova charger after each pack was fully discharged first, all taken over the last few days. I have also confirmed these capacities on a SkyRc T100 which gives almost identical results. All my packs are fully discharged and then charged before being put into storage (in a fireproof case) after use and have been since they were new. The first charge is always a trickle charge at 0.4A, subsequent charges have all been fast charges upto a maximum of 3A Tamiya NiCd 1400mah, 7.2v = 20 yrs old, 1000+ charges, 1350mah (lost 50mah) Overlander NiMh 3300mah, 7.2v = 1 month old, 6 charges, 3000mah (lost 300mah) Absima NiMh 3600, 7.2v = brand new, 1 trickle + 1 discharge/recharge cycle, 3300 (lost 300mah) Sanyo NiCd 2000mah, 7.2v = 18 yrs old, 1000+ charges, 1800mah (lost 200mah) Sanyo NiCd 2000mah, 8.4v = 18 yrs old, 2000+ charges, 1600mah (lost 400mah) - my most heavily used packs, always used in with 13T Dyna Run Super Touring or Reedy 19T spec motors. Sanyo NiCd 2000mah, 9.6v = 18 yrs old, 100+ charges, 2000mah (no loss) So in summary, Tamiya and Sanyo NiCd's that are over 18+ years old are still retaining most of their original capacity whereas brand new NiMh packs are not even taking 90% of their claimed capacity. Has anybody else experienced this sort of performance? I will be switching to LiPo next year and gradually swapping all our fleet into them and I will be interested to know if anybody had done similar comparisons on a range of LiPos?