Thanks Meter 129
Join Date: May 2010
Location: Metro NY/NE Region
Are you using a battery monitor on the Eris? I highly recommend using it as you can check to see what's running in the background (i.e Maps did manage to stay on or come back - maybe, delicate touchscreen issues ??) that might be "draining" the battery - even after a proper calibration & several full charge/discharge cycles.
Depending on the custom ROM, it could be the widgets, clock/weather/news app, email, or even screen settings, etc. Up until last week, I had a nearly 30 months old HTC battery (from the Ozone @ 1500 maH) in the now decommissioned, WiFi only Eris and it was fine - holding a solid charge for typically 20+ to 30 hours of light/moderate usage & standby time.
Asus Nexus 7 32GB WiFi, 4.2.2 rooted stock kernel w. Flash
HTC Incredible 2 x 2, unlocked S-OFF Revol. CWM 18.104.22.168 HB.97 (6.13.1002) TSM UBE 2.1X, SR's Zeus R1.3, Nit's Stock Sense v5.0.m-ext4, etc.
Viewsonic Vpad7-CWM 5.x EUv1.7b ITE Rom 2.2.2 hw107, A2SD, 3G AT&T+WiFi
HTC Droid Eris-GB 2.3.5 CM7 V.24RIP-Vanila-ICS, WiFi only (2.42.02.10.29)
HTC Ozone (unlocked GSM+CDMA) 3VO ROM: WinMo 6.5-CMHK/AT&T
Sony E. W995 CID53Red, R1HA036 generic, C905 custpack. T-Mo & CMHK/CN+