Welcome to the forum! I know what you mean about batteries. The thing about them that I don't like is you never know what kind of cells you're going to get in a pre-made battery and you could end up dishing hundreds of dollars for something that won't last very long. So in my opinion, it's best if you take a couple of weeks to read through the stickied threads in the battery technology forum. This way you will learn what types of batteries are best for what applications, how to assemble your own packs, how to get the best performance/range (pick one ) out of them, etc. This way, you will not only be able to build a battery that matches your ebiking needs, but also do it at a fraction of the cost of a pre-made one and be able to fix things for cheap in case anything goes wrong, rather than replacing the whole battery.

I spent the past few weeks reading about lipo's and if you can accept the small risk that they may get into thermal runaway, then you can build an amazing pack with easily replaceable cells for around $200-$300. The technology used in them is much safer than it was 1 or 2 years ago, so as long as you don't overcharge, over-discharge, or smash the lipos you're golden. For many people, monitoring the overcharge and under-discharging is the only "hassle" of using lipos. But IMO, I trust my brain more than any electronic BMS.

Otherwise, go for LiFePO4. They're more expensive initially, weigh slightly more, are larger, and will give you less performance in the area of acceleration/top speed, but they do last a little longer than lipo and are as plug-and-play as batteries get.

I'll probabaly start a "rebuild" thread for my ebike that I'm upgrading, and in it I'll explain what I did with my battery system. So if you're looking at running an easy, cheap 20s2p lipo (that's ~74V, 10ah) solution, then be on the lookout for my thread. But to get you started, I'll list the items that I bought (a so-called "shopping list", which you can search for a specific shopping list for the type of pack you want to build to see if anyone has done the same before) but I'll leave you to figure out what everything is for and what to do with it all as that is too much to explain properly in one post.

Here's what I bought:
- 2 Meanwell (cloned) chargers which will be connected in series to charge to ~82V: http://www.ebay.ca/itm/?ssPageName=STRK:MEWNX:IT&_trksid=p.m.l#ht_wt_905

- 5 of these to balance the cells while bulk charging: http://www.ebay.ca/itm/?ssPageName=STRK:MEWNX:IT&_trksid=p.m.l#ht_wt_905

- 11 of these for a 20s2p configuration (bought 1 extra as a backup): http://www.hobbyking.com/hobbyking/store/____Turnigy_mAh_4S1P_14_8v_20C_hardcase_pack.html

- and this to hold the batteries in (no room on my frame and it keeps them out of the cold): http://www.ebay.ca/itm/?ssPageName=STRK:MEWNX:IT&_trksid=p.m.l

- I'll still need some extra things like wire and connectors to connect everything together, but I haven't decided upon that yet

Well, I wish you luck on your search for the best battery ever!
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Hi olliemontague,Welcome to the forum! I know what you mean about batteries. The thing about them that I don't like is you never know what kind of cells you're going to get in a pre-made battery and you could end up dishing hundreds of dollars for something that won't last very long. So in my opinion, it's best if you take a couple of weeks to read through the stickied threads in the battery technology forum. This way you will learn what types of batteries are best for what applications, how to assemble your own packs, how to get the best performance/range (pick one) out of them, etc. This way, you will not only be able to build a battery that matches your ebiking needs, but also do it at a fraction of the cost of a pre-made one and be able to fix things for cheap in case anything goes wrong, rather than replacing the whole battery.I spent the past few weeks reading about lipo's and if you can accept the small risk that they may get into thermal runaway, then you can build an amazing pack with easily replaceable cells for around $200-$300. The technology used in them is much safer than it was 1 or 2 years ago, so as long as you don't overcharge, over-discharge, or smash the lipos you're golden. For many people, monitoring the overcharge and under-discharging is the only "hassle" of using lipos. But IMO, I trust my brain more than any electronic BMS.Otherwise, go for LiFePO4. They're more expensive initially, weigh slightly more, are larger, and will give you less performance in the area of acceleration/top speed, but they do last a little longer than lipo and are as plug-and-play as batteries get.I'll probabaly start a "rebuild" thread for my ebike that I'm upgrading, and in it I'll explain what I did with my battery system. So if you're looking at running an easy, cheap 20s2p lipo (that's ~74V, 10ah) solution, then be on the lookout for my thread. But to get you started, I'll list the items that I bought (a so-called "shopping list", which you can search for a specific shopping list for the type of pack you want to build to see if anyone has done the same before) but I'll leave you to figure out what everything is for and what to do with it all as that is too much to explain properly in one post.Here's what I bought:- 2 Meanwell (cloned) chargers which will be connected in series to charge to ~82V: http://www.ebay.ca/itm/?ssPageName=STRK:MEWNX:IT&_trksid=p.m.l#ht_wt_905- 5 of these to balance the cells while bulk charging: http://www.ebay.ca/itm/?ssPageName=STRK:MEWNX:IT&_trksid=p.m.l#ht_wt_905- 11 of these for a 20s2p configuration (bought 1 extra as a backup): http://www.hobbyking.com/hobbyking/store/____Turnigy_mAh_4S1P_14_8v_20C_hardcase_pack.html- and this to hold the batteries in (no room on my frame and it keeps them out of the cold): http://www.ebay.ca/itm/?ssPageName=STRK:MEWNX:IT&_trksid=p.m.l- I'll still need some extra things like wire and connectors to connect everything together, but I haven't decided upon that yetWell, I wish you luck on your search for the best battery ever!

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