you are very lucky
personally i dont know any smartphone who can stay alive 2 days without charging if using wifi, even on standby
My Samsung Galaxy S5 gets 2-3 days on normal usage (3-4 hours screen time) when connected to other Wifi networks.
This is reduced to 1-2 days and 2-3 hours screen time when connected to a Mikrotik Wifi network.
I experience 30% faster battery drain on Mikrotik networks.
What’s new in 6.30 (2015-Jul-08 09:07):
*) wireless - added WMM power save suport for mobile devices;
*) firewall - sip helper improved, large packets no longer dropped;
*) fixed encryption ‘out of order’ problem on SMP systems;
*) email - fix sending multiple consecutive emails;
*) fixed router lockup on leap seconds with installed ntp package;
*) ccr - made hardware watchdog work again (was broken since v6.26);
*) console - allow users with ‘policy’ policy to change script owner;
*) icmp - use receive interface address when responding with icmp errors;
*) ipsec - fail ph2 negitioation when initiator proposed key length
does not match proposal configuration;
*) timezone - updated timezone information to 2015e release;
*) ssh - added option ‘/ip ssh stong-crypto’
*) wireless - improve ac radio coexistence with other wireless clients, optimized
transmit times to not interfere with other devices;
*) console - values of $“.id”, $“.nextid” and $“.dead” are avaliable for
use in ‘print where’ expressions;
*) console - ‘:execute’ command now accepts script source in “{}” braces,
like ‘/system scripts add source=’ does;
*) console - ‘:execute’ command now returns internal number of running job,
that can be used to check and stop execution. For example:
:local j [:execute {/interface print follow where [:log info “$name”]}]
:delay 10s
:do { /system script job remove $j } on-error={}
*) console - firewall ‘print’ commands now show all entries including
dynamic, ‘all’ argument now has no effect;
*) ipsec - increase replay window to 128;
*) fixed file transfer on devices with large RAM memory;
*) pptp - fixed “encryption got out of sync” problem;
*) ppp - disable vj tcp header compression;
*) api - reduce api tcp connection keepalive delay to 30 seconds,
will timeout idle connections in about 5 minutes;
*) pptp & l2tp & sstp client: support the case were server issues its tunnel
ip address the same as its public one;
*) removed wireless package from routeros bundle package,
new wireless-fp is left in place and wireless-cm2 added as option;
*) pptp & l2tp client: when adding default route, add special exception route for
a tunnel itself (no need to add it manually anymore);
*) improved connection list: added connection packet/byte counters,
added separate counters for fasttrack, added current rate display,
added flag wheather connection is fasttracked/srcnated/dstnated,
removed 2048 connection entry limit;
*) tunnels - eoip, eoipv6, gre,gre6, ipip, ipipv6, 6to4 tunnels
have new property - ipsec-secret - for easy setup of ipsec
encryption and authentication;
*) firewall - added ipsec-policy matcher to check wheather packet
was/will be ipsec processed or not;
*) possibility to disable route cache - improves DDOS attack
handling performance up to 2x (note that ipv4 fastpath depends on route cache);
*) fasttrack - added dummy firewall rule in filter and mangle tables
to show packets/bytes that get processed in fasttrack and bypass firewall;
*) fastpath - vlan interfaces support fastpath;
*) fastpath - partial support for bonding interfaces (rx only);
*) fastpath - vrrp interfaces support fastpath;
*) fixed memory leak on CCR devices (introduced in 6.28);
*) lte - improved modem identification to better support multiple identical modems;
*) snmp - fix system scripts table;
What setting I must turn on to get this power saving feature working?
In Interfaces → Wireless in Advanced Mode, you will find the choice of VMM Support
How about via CAPsMAN?
On every device turn this option?
Ok. It is ready but, how to enable it for CAPsMAN CAP’s?
What’s new in 6.31rc10 (2015-Jul-28 08:59):
*) wireless - improved WMM-PowerSave support in wireless-cm2 package;
/interface wireless set 0 wmm-support=enabled
Does not work. No wireless interfaces in my CAPsMAN (CCR).
bump
CAPsMAN doesn’t support all the features. We will see if we can add it later. Currently only on AP itself.
if I enable wwm on AP, then add to CAPsMAN, will be feature enabled?
for CAPsMAN managed CAPs, wmm power save is enabled by default (can’t turn off)
you need v6.31rc11 and wireless-cm2
there is no status, you just have to believe my words 
Why are these improvements made only for wireless-cm2? I need this for my home router, actually I have two for roaming, but i don’t need capsman so I’m using the wireless-fp package.
edit: http://forum.mikrotik.com/t/6-31-rc-testing/89563/1
Have installed rc11with cm2 from rc10 and all my capsman config has disappeared!!! 
No provision rules, no configs, no datapaths… !!! Nothing!!! Empty winbox tabs under capsman. New terminal export hangs!
EVERYTHING RETURNED WITH RC10… UFFF! Do not make this things to my heart or it will break young…
Please take a look. We need WMM power save.
Maybe you had jumped from capsman to capsman2 ? (fp ..to ..cm2 package)
We believe your words, but I need some clarifications:
- untill 6.28 only legacy mode power saving (wmm)
- from 6.29 to 6.30.2 “new” wmm power saving is available (but silently disabled on caps/capsman)
- from 6.31rc11 “newer” wmm power (improved..??..no more infos) and default enabled on caps/capsman
Since I had some little wifi connections problems with “new” wmm on 6.30.x (my cell wifi connects only after many tries ..and it seems to prefer low signal diferent ap on other room) I really need to know exactly how to handle this.
In 2/3 days I’m going to setup a warehouse with 10 ap using capsman2 (now I’m on 6.30.2 here) and I already know I’ll have to fight against some wifi motorola bar code reader. So I really need to know how to enable/disable this wmm power saving feature.
Always used capsman v2. Reported to MK and waiting for reply. Thanks for your interest.
Please, keep the topic update with mt news ..tnx
Normis/mt .. probably on holidays ? 