Installed Oxford Hot Hands Heated Grips, now charging issues

[tom203]

That LED controller looks like .(point) 8 amps max.
For simplicity, you could put a 5 volt zener diode in series with each grip- this drops current down to less than 1 amp each grip,so power is reduced by more than half. Of course you need a 5 watt zener, but these can be had for less than a buck on ebay.

[rustybronco]

Dunno.......

Product Description
Product Information Dimmer is a controller that it can adjust brightness infinitely,its control mode is knob-operated control, you could adjust light to the appropriate lighting brightness in accordance with your actual need. Technical parameters ● Working temperature: -20-60 ℃ ● Supply voltage: DC12V ●Output: 1 channel ● External dimension: L89 Χ W59 Χ H35 mm ● Packing size: L96 Χ W64 Χ H65 mm ● Net weight:8 5 g ● Gross weight: 10g ● Static power consumption: <1 W ● Output current: <8 A ● Max. output: 96 W

[posplayr]

That LED controller looks like .(point) 8 amps max.
For simplicity, you could put a 5 volt zener diode in series with each grip- this drops current down to less than 1 amp each grip,so power is reduced by more than half. Of course you need a 5 watt zener, but these can be had for less than a buck on ebay.

The spec is 8. Amp @ 12v or 96 watts not 0.8 amps. It also specs 1 watt loss which is way better than a Zener. This is basically the same design Rusty speculated about and you can buy it straight from China for $3.50.

In principle this could be used to pwm any dc load.

[Matchless]

Then one night I accidentally left the grips turned on while the bike was parked, for about 3-4 hours (I know, should have used a relay to prevent this). When I returned to ride, the battery was dead.

I think you should also have another look at your wiring and rather wire it after the ignition switch or fit a relay.

[posplayr]

The spec is 8. Amp @ 12v or 96 watts not 0.8 amps. It also specs 1 watt loss which is way better than a Zener. This is basically the same design Rusty speculated about and you can buy it straight from China for $3.50.

In principle this could be used to pwm any dc load.

http://www.amazon.com/gp/product/B004T9ITQ0/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A32KVGD9EJYNWQ

This one is only rated at 2 amps which is 2x14=28watts which may possibly work for some glove heaters

[posplayr]

This auction lets you select which of several options you might like:

http://www.ebay.com/itm/Dimmer-Brightness-Wireless-Remote-Dimmer-for-Single-RGB-Color-LED-Strip-12-24V-/390717736395?pt=US_Lighting_Parts_and_Accessories&var=&hash=item5af89785cb

This might be cool and could probably be made waterproof much easier.

http://www.amazon.com/SUPERNIGHT-Wireless-Remote-Dimmer-Controller/dp/B00BPNXA1C/ref=pd_sbs_misc_3

But this does claim to be waterproof and it has two 5 amp channels but it is simple On/Off and not a dimmer.

http://www.amazon.com/AGT-Waterproof-Wireless-Universal-2-Channel/product-reviews/B0068D0OBI/ref=cm_cr_pr_hist_5?ie=UTF8&filterBy=addFiveStar&showViewpoints=0&sortBy=bySubmissionDateDescending

If you put the fob on your key chain you could probably easily adjust it (depending on gloves). Anyway there appear to be a few very cheap options for controlling +12V power output

http://www.amazon.com/dp/B00G9Y04XO/ref=asc_df_B00G9Y04XO2893311?smid=A1CSCZ8CRWX2GH&tag=dealtmp649328-20&linkCode=asn&creative=395105&creativeASIN=B00G9Y04XO