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Any 52t one, with square tapered crank-shaft should do...

Can anyone advise me on conditioning new LiFePO4 batteries? I've read conflicting reports that you should just keep them fully topped up and others that you should deep discharge them a few times when new. Not sure which is the best approach? Also, is is right that it's best to keep them as...

Fitted the new chain-wheel / cranks - 52 teeth seem to work fine - makes gearing usefully higher than it seemed under power previously, but obviously better top speed. :)

Hard to imagine needing more power / speed... :D I'm already having to slow-down approaching bends going uphill!! :D

Test Latest multi-terrain test - 3 mile lap, half up hill, 1/4 flat, 1/4 downhill, half B Road, half country lanes. Previous record going flat out 10 min 10 seconds (about 15mph avg). Cruised around today on damp roads using nothing below 5th gear, 8 mins 30 seconds (avg 21mph) :D

Did another quick ride up one of the most evil hills locally as a stress test - 'phenomenal' is the only word!!! ;0) :0))

The Beast lives! (at least for now!) Glad to hear that :) So first bit of good news - the Battery Supplies 36v 10AH LiFePO4 unit delivered seems to be a 12AH one, judging by the size of it :D So it can supply up to 24A peak. Was a pain to get it to fit - power pins were reversed compared to...

Standard controller? Before I plug the new 36v battery in, can I verify that this is the standard controller? It's dated 2009, so just wondering if it's been updated since? I've upped the controller power resistor rating to 6W and thermally connected the regulator to the case (using...

Cranksets... Will check those out - thanks again! :) I notice the hall sensor has a large 'washer' next to it inside the chain-wheel. Presume it's necessary / removable / refitable?

Have been investigating chain-wheels / crank-sets and this looks good for the price - do you know if the existing chain is compatible with Shimano kit? Shimano FC-2300 square taper chainset - www.fatbirds.co.uk Might thermally connect the voltage regulator to the case, as it's in a convenient...

Good thinking - but unfortunately, I ordered 2x100Rs this morning :p Guess the regulator can take it, if yours worked for a fair while...

The power resistor in question appears to be a 51R 5% 3W metal film type, for reference. Paralleling a pair of 100R's of the same type should do the job, I would think...

Makes sense to go the chain-wheel route, as I'm going to have to remove the cranks to sort the bottom-bracket out, in any case. I'll check and change the controller resistor before using the 36v battery...

Thanks d8veh - I'll have to borrow a crank puller and see what's what. Have been thinking of getting a new chain-wheel with more teeth - I expect running 36v, it'll be hard to keep up with the motor at any acceptable level of cadence otherwise. Might just replace the whole crank / chain-wheel...

36v LiFePO4 battery... Finally got round to ordering a 36v 10Ah LiFePO4 battery from Battery Supplies in Belgium. Should arrive by the end of the week. Total cost delivered: £191 including 2A charger and 6 months warranty, which seems a very fair price. :) My bike is 3 or 4 years old and I...

Not yet, but planning to in the near future...

Custom 'light-weight / low-cost / short range' packs from Battery Supplies: 5Ah 36v LiFePO4 - 2C constant / 4C peak current + Silver Fish case + charger delivered: £136 5Ah 36v LiMnO2 - 2C constant / 4C peak current + Silver Fish case + charger delivered: £101 Battery weight - around 2kg...

Some more prices from Battery Supplies: 2A 36v charger only ( for LiFePO4 or LiMnO2) : £24 Upgrade existing Silver Fish case to 36v 10Ah LiFePO4: £177 Custom 5Ah 36v LiFePO4 + Silver Fish case + charger delivered: around £125 (to be confirmed) Empty Silver Fish cases are available, but...

Battery Supplies spec sheet... Here's the Battery Supplies e-bike battery range spec sheet in English: http://www.notjustmetal.com/docs/110315BS_fietsbatterijenLR_ENG.pdf

Well, I suppose that would depend on the A2D chip power rail / voltage reference? More likely to be CMOS chips in a battery powered circuit with up to 15v rails, so if they happened to have used the rail as reference (the lower cost approach), it might be that the input voltage range is...