Frame Bags for Battery and Wire Management.

I am looking for a frame bag for concealing a 52v 17.5ah Hailong battery. Are there any bags like that with the bottom cut out to make room for the battery mount?
 
I have a nylon canvas plumber's tool bag on the rack of one of my bikes. These tool bags come in many shapes and sizes. Just measure and cut to accommodate the mount. I melted holes in mine for mounting it so it would not fray. The one in this photo is leather.
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Thanks for the friendly comments. I'm in Auckland, NZ. Just over the horizon from GB across the Pacific from you. Yes saddle is black Brooks B17. Hub is 8 speed Alfine. Trigger shift. And Gates Belt. With the front hub, and belt and IHG, we travel totally silently. Even coasting. That was always the aim - silent with minimum maintenance. When I fit the BB torque sensor, I'm changing the front cog to 46 - down from 50 - and rear to 26 up from 24 with 118 tooth belt to give better ratio in lower gears. Front tyre is Schwabe Marathon - I had the whole front wheel built by Grin and they also supplied the tyres - but I forgot to order the tube so bought that locally. The rear tyre is original Snake skin - totally smooth but tough. I'll change that to Schwabe when I do the torque sensor. The smooth tyre was a surprise when I bought the bike - second hand - but has been very good on dry road. Not much fun on wet dirt. Next time, I'll go with a smaller direct drive motor and built wheel myself but being first time, I just wanted to get going. The extra freight on the whole wheel was substantial but one off.
 
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