Good idea. That's what I would do because Lifepo4 can be got for only $100 more. did you see the price of the 36v20AH at elitepowersolutions.com? $312 for 36v20AH. No BMS but for that price, it doesn't really matter because it's so cheap, it's still a great buy because even without a BMS, it will still last 3 or 4x longer than SLA. You could essentially just use 50 - 60 % of it and not worry about a BMS and still get a hell of a lot more usage out of it than a SLA battery.