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Thanks so much guys..... gwhy, I have now spoken to him and the batteries are BMS protected and said he would never entertain building them with out. I have gone ahead with the order now. awdrocks, I have a 16" 36v at present which this conversion is for. The guy who is building the batteries had a 42v set on his 12.5".

Thanks for your reply. This is the next reply I have received about the kit. The larger pack would cost £300 as there's a fair bit more work in getting a 12s pack into the Oset 36v. I recommend you go for the 10s pack where the throttle power gauge will work just fine, but what you might find is that it will stay on 4 bars for 80 -90 % of the battery capacity and then drop off quite rapidly. I can fit a gauge to the side of the actual battery pack as they are panel mounted pcb's if you wish, which is designed specifically for lithium packs, but to be honest it won't really be needed, the one on the throttle will do exactly the same job. When the pack drains it will cut off immediately, but if the bike is turned off and on again it will go for another bit before stopping and so on with decreasing intervals of power, this protects the cells and is normal for all lithium powered devices. A 10s pack will absolutely not do any harm to either speed controller or motor on a 36v Oset as it's as close as you can get with a lithium pack to SLA without sacrificing power due to lower voltage. I hope this helps and if you have any more questions I'd be more than happy to answer them as best I can. So i need to ask if the if they are BMS protected. The battery pack is different to the one listed. He said it would be 10s 42v pack. Are Lithium batteries the same as Lippo batteries? Does anybody know anyone who may build a set that would be key turn ready as I ideally want two sets. 1 for a 36v 16 and another for a 24v 12.5. Thanks!!!

Hi Guys, I am new to the forum and the world of electric bikes. My son has a 36v Oset and as others have poor battery life. I have been reading this post with great interest but do not personally feel confident to take on this task. Whilst looking on ebay for a 12.5 for my youngest I came across this http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130860920695&ssPageName=ADME:X:eRTM:GB:1123 I have spoke to the guy and he will make up the batteries to two different specs. He says he has 42v on his sons 12.5 24v bike and it's running fast a reliable. He has offered me the same 42v or 50.4v. He has built in cut off circuit boards to protect the batteries and a one charger system for the battery pack. I will copy and paste his specs. My question is do you think that these will be ok and or should I go for the 42v or 50.4v Thanks in advance Richard. Thanks for the interest, my son also has a Oset, a 24v 12.5 and I built a 42v lithium ion battery pack for it, it flies, and ive had no problems with it whatsoever, these wee bikes can handle a fair bit of voltage. I would suggest a 10s (10 cells in series) pack - 42v peak, 37v nominal and 30v cutoff for your 36v or if you want I could build you a 12s pack 50.4v peak 44.4v nominal and 36v cutoff? To build a 10s pack with approximately 20ah capacity you are talking £250 plus postage, I know this sounds a lot of money and it is! but this lithium ion battery will provide more power than the SLA batteries and last twice as long with a flatter power curve too. This price includes a charger and also an extra pair of HXT battery terminals to solder to the battery leads on the bike. The battery will have two leads with HXT connectors on them, one to connect to the bike and a lighter gauge lead for charging, with a matching connector on the charger lead. Next reply As I said, my sons Oset has a 42v pack even though its 24v standard with no problems whatsoever. A 42v peak battery pack is as close as you will get to 36v as the nominal voltage is 37v. A lithium battery cell has a fully charged voltage of 4.2v and as it drains a built in circuit board stops the cells going any lower than 3.0v, this is the cutoff voltage. The nominal voltage is in the middle and is 3.6/3.7v. The battery pack has one charge lead which will charge the whole pack at once and the built in circuit board (BMS) controls the charging of each group of cells within the pack ensuring they are not overcharged, undercharged and prides short circuit protection also. Hope this helps.