# New Group 31 Gel batteries in a 2009 GEM **URL:** \ **Category:** GEM Forum\ **Created:** [February 7, 2019, 10:13pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393 "2019-02-07T22:13:40Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![cleanvehiclesgb](https://avatars.discourse-cdn.com/v4/letter/c/c37758/32.png) [@cleanvehiclesgb](https://community.electricforum.com/u/cleanvehiclesgb)\ **Post date:** [February 7, 2019, 10:13pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/1 "2019-02-07T22:13:40Z")
Can anyone tell us how many minutes on a Lester 72v discharger you should get out of a new pack of 6 12v group 31 gel batteries? Thank you. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [February 7, 2019, 10:53pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/2 "2019-02-07T22:53:39Z")
Do the math. Look up the amp hour rate of batteries and the discharge current. A 100ah battery will discharge in 10 hrs @ 10a rate. (theory) ---
**Author:** ![cleanvehiclesgb](https://avatars.discourse-cdn.com/v4/letter/c/c37758/32.png) [@cleanvehiclesgb](https://community.electricforum.com/u/cleanvehiclesgb)\ **Post date:** [February 8, 2019, 2:58pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/3 "2019-02-08T14:58:09Z")
Thanks for your reply but I’m not clearly understanding. We have 6 12v gel batteries rated at 98 at the 20 hour cap rate on the spec’s. Lester 72v discharger discharges at 75 amps down to 63v. We are getting 30 minutes on the discharger. Not sure how to follow your formula. Any further advice? Thanks. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [February 8, 2019, 3:53pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/4 "2019-02-08T15:53:08Z")
1/2 hour at 75a = 37.5ah at 75a rate As ah will be lower at higher discharge, it may be ok. You would need the ~1c rate or 3/4c rate from battery specs. ---
**Author:** ![cleanvehiclesgb](https://avatars.discourse-cdn.com/v4/letter/c/c37758/32.png) [@cleanvehiclesgb](https://community.electricforum.com/u/cleanvehiclesgb)\ **Post date:** [February 8, 2019, 7:45pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/5 "2019-02-08T19:45:07Z")
Thank you. Unfortunately they don’t post anything that says 75 amp rate or anything like that on the spec sheets. Only that Res Cap at 25 amps is 190 and that the 20 hour rate is 98. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [February 8, 2019, 9:08pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/6 "2019-02-08T21:08:26Z")
![image](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/2/2d397d29bc197ecf38fb4db4b153acdcd024e20d.png) ---
**Author:** ![cleanvehiclesgb](https://avatars.discourse-cdn.com/v4/letter/c/c37758/32.png) [@cleanvehiclesgb](https://community.electricforum.com/u/cleanvehiclesgb)\ **Post date:** [February 8, 2019, 9:30pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/7 "2019-02-08T21:30:28Z")
Thanks so much. Our spec sheet only showed the 25 amp rating. Don’t know where you found it but this answers our question. Much appreciated. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [February 8, 2019, 10:19pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/8 "2019-02-08T22:19:56Z")
[http://www.northcountrygolfcar.com/docs/ultrapower\_battery.pdf](http://www.northcountrygolfcar.com/docs/ultrapower_battery.pdf) ---
**Author:** ![cleanvehiclesgb](https://avatars.discourse-cdn.com/v4/letter/c/c37758/32.png) [@cleanvehiclesgb](https://community.electricforum.com/u/cleanvehiclesgb)\ **Post date:** [February 8, 2019, 10:50pm UTC](https://community.electricforum.com/t/new-group-31-gel-batteries-in-a-2009-gem/15393/9 "2019-02-08T22:50:59Z")
Thanks! Sincerely, Gary Birke Motorworks Clean Vehicles, Inc. 111 Sunrise Highway Amityville NY 11701 1(631)608-4380 [Gary@CleanVehiclesNY.com](mailto:Gary@CleanVehiclesNY.com) [WWW.CleanVehiclesNY.com](http://WWW.CleanVehiclesNY.com) [Like Us On Facebook!](https://www.facebook.com/MotorworksCleanVehicles)