I have now removed the 09 cradle form the Mtrax GSM and done some wiring mods for lipo. Under static test 10s and 12s lipo both work fine with the 36v system, on the road the 10s with lcd set to 32km/h max topped out at 22.2 mph on a 10.5 mile blast around town this evening so I'm hopeful on a range test of 25 - 30 miles. Next ride out will be to see how it performs with 12s.
In total I have 12 soft case packs made up to give me 3 x 10s @ 10.4ah with 10c discharge rate
all for £200 from HK and a 350W 30a PSU and BC168 off Fleabay for a bargain £24 recently all this partly offset by me clearing £170 by selling bike parts on Fleabay over the last 14 days.
Next I need to do the same with my F/S Cube BBS01 mtb, but by the sounds of it on ES 12s may not work.
2 twin packs are run in series then in parallel to give 10.4ah, series and parallel leads not shown.
All these packs were quite good and all came at a storage charge of between 3.8 & 3.83 per cell.
Outer case made up from twin wall Correx sheet bound in Duck tape and stick on Velcro to keep packs in situ. My Correx comes from road side signs that never seem to get picked up when resurfacing is finished weeks after or old polling signs.