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[badnewswade]

Hi folks, I need advice on battery replacement. I have an 800w Chinese moped, the batteries have been sitting around for six months without being maintained and so it only does 12 miles or so per charge. (top speed is 28mph). They're 20ah SLAs, I am going to try replacing them with a 28ah set and probably also a 10ah set (to sit in the luggage compartment). The question is, how much mileage do you think I'll get, and on the basis of mileage would I be better off with a bigger motor? I would have thought that a bigger motor (like a 1.5Kw) would consume more juice and therefore reduce range. Also at what point do ppl think that adding more batteries would just be counterproductive due to the weight? Should I just replace the 20ah pack with another one and not try for more amps, or am I right to be adventurous?

And finally, I've seen Lithium packs on Ebay - PingBattery do their 48v20ah pack for $700, and this guy called cammy_cc who does a 40ah pack for $838. Ping is well known and respected, but has anyone had any dealings with cammy? What sort of range could I expect from these battery packs?

Here is the specs on what I've got anyway

http://miwamzy.diytrade.com/sdp/453125/4/pd-2504449/2284572-1253510.html

And here's cammy_cc's battery

http://cgi.ebay.co.uk/LiFePO4-48V-40AH-Electric-Scooter-E-Bike-Battery-power_W0QQitemZ180328010011QQcmdZViewItemQQptZScooters?hash=item180328010011&_trksid=p3286.c0.m14&_trkparms=72%3A1683|66%3A2|65%3A12|39%3A1|240%3A1318

He looks pretty kosher, but of course when the supplier is on the other side of the world and wants the best part of a grand, you want to get it right first time...

[Bogan]

im not too sure bout battery suppliers, but should be able to help with the rest.
Firstly you current batteries, have around 8Ahrs, judging from your suplied range and top speed data.
The milage will just scale accordingly with the increased ahrs.

Bigger motor = higher speed = less total milage.

Total battery weight varys bike to bike, keep adding them until it starts to feel heavy (or greatly exceeds the original weight) would be my advice.