S2000 battery drain
Discussion
Hi I am new here, I joined to find what members had learned on the above topic. So figured it might help someone else if I posted my own findings.
My S2000 has the original Hamilton Palmer alarm, I suspected it of significant battery drain. When measured the drain was a constant 700mA from.the car battery. I figured the likely drain was the system trying to charge the backup battery in the alarm siren, whilst the car was not running. The siren internal horn has a quick release plug to its small battery pack, so I disconnected that then retested battery drain (overnight with the alarm connected). The battery dropped 140mV overnight, 10 hrs .... which on the 45mAh battery I think equates to about 14mA drain each hour.
The faulty batteries are made from a set of 6 cells potted into the siren lid. I have located what I believe are the equivalents ... Alarm Bell Box Battery 7.2V 7.2-Volt Ni-MH GP320BVH6A6 which I will test in situ to re-estabish the standby alarm if the main car battery is tampered with during a theft event.
If the battery swap works and I can "unpot" the defective cells, the system will have all its original functionality without main battery drain.
My S2000 has the original Hamilton Palmer alarm, I suspected it of significant battery drain. When measured the drain was a constant 700mA from.the car battery. I figured the likely drain was the system trying to charge the backup battery in the alarm siren, whilst the car was not running. The siren internal horn has a quick release plug to its small battery pack, so I disconnected that then retested battery drain (overnight with the alarm connected). The battery dropped 140mV overnight, 10 hrs .... which on the 45mAh battery I think equates to about 14mA drain each hour.
The faulty batteries are made from a set of 6 cells potted into the siren lid. I have located what I believe are the equivalents ... Alarm Bell Box Battery 7.2V 7.2-Volt Ni-MH GP320BVH6A6 which I will test in situ to re-estabish the standby alarm if the main car battery is tampered with during a theft event.
If the battery swap works and I can "unpot" the defective cells, the system will have all its original functionality without main battery drain.
I am unable to confirm whether the Alarm fitted to my 2003 Accord and 2007 CRV were the same manufacturer as what you have described in your S2000, but in both cases I had to replace the alarm siren unit for the same reason (parasitic draw).
Admittedly this was a few years back, but I simply replaced with a siren unit from a 'newer' vehicle being broken on ebay and it resolved the issue on both occurrences.
Good luck with your battery swap.
Admittedly this was a few years back, but I simply replaced with a siren unit from a 'newer' vehicle being broken on ebay and it resolved the issue on both occurrences.
Good luck with your battery swap.
The H and P alarm has caused me major issues in two different s2000s. They were always flaky and just got to the point where you couldn't start the car. I removed both, which is simple enough as you just join the wires cut by honda dealer back together. Didn't feel the need to install another one as they have a coded key immobilizer already and with soft top it's not a secure car anyway.
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